From that study, Cal had realized that it was a face that he himself might be able to climb unaided. And that meant a face that the alien certainly could climb unaided. If the alien should realize this, a simple jerk on the rope that was tied around Cal would settle the problem of the alien as far as human competition went. Cal would be plucked from his meager hand and footholds like a kitten from the back of a chair, and the slope below would dispose of him. He sweated now, climbing, trying to remember the path up the towerside as he had planned it out, from handhold to handhold, gazing through the long-distance viewer.
He drew closer to the top. For some seconds and minutes now, the rope below him had been completely slack. He dared not look down to see what that might mean. Then finally he saw the edge of the cup-shaped depression above him, bulging out a little from the wall.
A second more and his fingers closed on it. Now at last he had a firm handhold. Quickly he pulled himself up and over the edge. For a second perspiration blurred his vision. Then he saw the little, saucer sloping amphitheater not more than eighteen feet wide, and the further walls of the tower enclosing it on three sides.
Into the little depression the light of K94 blazed from the nearly black sky. Unsteadily Cal got to his feet and turned around. He looked down the wall he had just climbed.
The alien still stood at the foot of the wall. He had braced himself there, evidently to belay Cal against a fall that would send him skidding down the rock slope below. Though what use to belay a dead man, Cal could not understand, since the more than thirty feet of fall would undoubtedly have killed him. Now, seeing Cal upright and in solid position, the alien put his hands out toward the tower wall as if he would start to climb.
Cal immediately hauled taut on the line, drew a knife from his belt and, reaching as far down as possible, cut the line.
* * *
The rope end fell in coils at the alien's feet. The alien was still staring upward as Cal turned and went as quickly as he could to the center of the cup-shaped depression.
The wind had all but died. In the semi-enclosed rock depression the reflected radiation of the star overhead made it hot. Cal unsnapped his pack and let it drop. He stripped off the gloves of his warmsuit and, kneeling, began to open up the pack. His ears were alert. He heard nothing from outside the tower, but he knew that he had minutes at most.
He laid out the three sections of the silver-plated Messenger, and began to screw them together. The metal was warm to his touch after being in the sun-warmed backpack, and his fingers, stiff and cramped from gripping at handholds, fumbled. He forced himself to move slowly, methodically, to concentrate on the work at hand and forget the alien now climbing the tower wall with a swiftness no human could have matched.
Cal screwed the computer-message-beacon section of the nose tight to the drive section of the middle. He reached for the propulsive unit that was the third section. It rolled out of his hand. He grabbed it up and began screwing it on to the two connected sections.
The three support legs were still in the pack. He got the first one out and screwed it on. The next stuck for a moment, but he got it connected. His ear seemed to catch a scratching noise from the outside of the tower where the alien would be climbing. He dug in the bag, came out with the third leg and screwed it in. Sweat ran into his eyes inside the mask faceplate, and he blinked to clear his vision.
He set the Messenger upright on its three legs. He bent over on his knees, facemask almost scraping the ground to check the level indicator.
Now he was sure he heard a sound outside on the wall of the tower. The leftmost leg was too long. He shortened it. Now the middle leg was off. He lengthened that. He shortened the leftmost leg again . . . slowly . . . there, the Messenger was leveled.
He glanced at the chronometer on his wrist. He had set it with the ship's chronometer before leaving. Sixty-six ship's hours thirteen minutes, and . . . the sweep second hand was moving. He fumbled with two fingers in the breast pocket of his warmsuit, felt the small booklet he had made up before leaving and pulled it out. He flipped through the pages of settings, a row of them for each second of time. Here they were . . . sixty-three hours, thirteen minutes—
* * *
A gust of wind nipped the tiny booklet from his stiffened fingers. It fluttered across the floor of the cup and into a crack in the rock wall to his right. On hands and knees he scrambled after it, coming up against the rock wall with a bang.
The crack reached all the way through the further wall, narrowing until it was barely wide enough for daylight to enter—or a booklet to exit. The booklet was caught crossways against the unevenness of the rock sides. He reached in at arm's length. His fingers touched it. They shoved it a fraction of an inch further away. Sweat rolled down his face.
He ground the thickness of his upper arm against the aperture of the crack. Gently, gently, he maneuvered two fingers into position over the near edge of the booklet. The fingers closed. He felt it. He pulled back gently. The booklet came.
He pulled it out
He was back at the Messenger in a moment, finding his place in the pages again. Sixteen hours—fourteen minutes—the computer would take four minutes to warm and fire the propulsive unit.
A loud scratching noise just below the lip of the depression distracted him for a second.
He checked his chronometer. Sixty-three hours, sixteen minutes plus . . . moving on toward thirty seconds. Make it sixty-three hours sixteen minutes even. Setting for sixty-three hours, sixteen minutes plus four minutes—sixty-three hours, twenty minutes.
His fingers made the settings on the computer section as the second hand of his chronometer crawled toward the even minute . . .
There.
His finger activated the computer. The Messenger began to hum faintly, with a soft internal vibration.
The sound of scraping against rock was right at the lip of the depression, but out of sight.
He stood up. Four minutes the Messenger must remain undisturbed. Rapidly, but forcing himself to calmness, he unwound the rest of the rope from about him and unclipped it. He was facing the lip of the depression over which the alien would come, but as yet there was no sign. Cal could not risk the time to step to the depression's edge and make sure.
The alien would not be like a human being, to be dislodged by a push as he crawled over the edge of the lip. He would come adapted and prepared. As quickly as he could without fumbling, Cal fashioned a slipknot in one end of the rope that hung from his waist.
A gray, wide, flat parody of a hand slapped itself over the lip of rock and began to change form even as Cal looked. Cal made a running loop in his rope and looked upward. There was a projection of rock in the ascending walls on the far side of the depression that would do. He tossed his loop up fifteen feet toward the projection. It slipped off—as another hand joined the first on the lip of rock. The knuckles were becoming pale under the pressure of the alien's great weight
Cal tossed the loop again. It caught. He drew it taut.
He backed off across the depression, out of line with the Messenger, and climbed a few feet up the opposite wall. He pulled the rope taut and clung to it with desperate determination.
And a snarling tiger's mask heaved itself into sight over the edge of rock, a tiger body following. Cal gathered his legs under him and pushed off. He swung out and downward, flashing toward the emerging alien, and they slammed together, body against fantastic body.
For a fraction of a second they hung together, toppling over space while the alien's lower extremities snatched and clung to the edge of rock.
Then the alien's hold loosened. And wrapped together, still struggling, they fell out and down toward the rock below accompanied by a cascade of rocks.
XI
"Waking in a hospital," Cal said later, "when you don't expect to wake at all, has certain humbling effects."
It was quite an admission for someone like himself, who had by his very nature omitted much speculation on either hum
bleness or arrogance before. He went deeper into the subject with Joe Aspinall when the Survey Team Leader visited him in that same hospital back on Earth. Joe by this time, with a cane, was quite ambulatory.
"You see," Cal said, as Joe sat by the hospital bed in which Cal lay, with the friendly and familiar sun of Earth making the white room light about them, "I got to the point of admiring that alien—almost of liking him. After all, he saved my life, and I saved his. That made us close, in a way. Somehow, now that I've been opened up to include creatures like him, I seem to feel closer to the rest of my own human race. You understand me?"
"I don't think so," said Joe.
"I mean, I needed that alien. The fact brings me to think that I may need the rest of you, after all. I never really believed I did before. It made things lonely."
"I can understand that part of it," said Joe.
"That's why," said Cal, thoughtfully, "I hated to kill him, even if I thought I was killing myself at the same time."
"Who? The alien?" said Joe. "Didn't they tell you? You didn't kill him."
Cal turned his head and stared at his visitor.
"No, you didn't kill him!" said Joe. "When the rescue ship came they found you on top of him and both of you halfway down that rock slope. Evidently landing on top of him saved you. Just his own natural toughness saved him—that and being able to spread himself out like a rug and slow his fall. He got half a dozen broken bones—but he's alive right now."
Cal smiled. "I'll have to go say hello to him when I get out of here."
"I don't think they'll let you do that," said Joe. "They've got him guarded ten deep someplace. Remember, his people still represent a danger to the human race greater than anything we've ever run into."
"Danger?" said Cal. "They're no danger to us."
It was Joe who stared at this. "They've got a definite weakness," said Cal. "I figured they must have. They seemed too good to be true from the start. It was only in trying to beat him out to the top of the mountain and get the Messenger off that I figured out what it had to be, though."
"What weakness? People'll want to hear about this!" said Joe.
"Why, just what you might expect," said Cal. "You don't get something without giving something away. What his race had gotten was the power to adapt to any situation. Their weakness is that same power to adapt."
"What're you talking about?"
"I'm talking about my alien friend on the mountain," said Cal, a little sadly. "How do you suppose I got the Messenger off? He and I both knew we were headed for a showdown when we reached the top of the mountain. And he had the natural advantage of being able to adapt. I was no match for him physically. I had to find some advantage to outweigh that advantage of his. I found an instinctive one."
"Instinctive . . ." said Joe, looking at the big, bandaged man under the covers and wondering whether he ought not to ring for the nurse.
"Of course, instinctive," said Cal thoughtfully, staring at the bed sheet. "His instincts and mine were diametrically opposed. He adapted to fit the situation. I belonged to a people who adapted situations to fit them. I couldn't fight a tiger with my bare hands, but I could fight something half-tiger, half something else."
"I think I'll just ring for the nurse," said Joe, leaning forward to the button on the bedside table.
"Leave that alone," said Cal calmly. "It's simple enough. What I had to do was force him into a situation where he would be between adaptations. Remember, he was as exhausted as I was, in his own way; and not prepared to quickly understand the unexpected."
"What unexpected?" Joe gaped at him. "You talk as if you thought you were in control of the situation all the way."
"Most of the way," said Cal. "I knew we were due to have a showdown. I was afraid we'd have it at the foot of the tower—but he was waiting until we were solidly at the top. So I made sure to get up to that flat spot in the tower first, and cut the rope. He had to come up the tower by himself."
"Which he was very able to do."
"Certainly—in one form. He was in one form coming up," said Cal. "He changed to his fighting form as he came over the edge—and those changes took energy. Physical and nervous, if not emotional energy, when he was pretty exhausted already. Then I swung at him like Tarzan as he was balanced, coming over the edge of the depression in the rock."
"And had the luck to knock him off," said Joe. "Don't tell me with someone as powerful as that it was anything but luck. I was there when Mike and Sam got killed at the Harrier, remember."
* * *
"Not luck at all," said Cal, quietly. "A foregone conclusion. As I say, I'd figured out the balance sheet for the power of adaptation. It had to be instinctive. That meant that if he was threatened, his adaptation to meet the threat would take place whether consciously he wanted it to or not. He was barely into tiger-shape, barely over the edge of the cliff, when I hit him and threatened to knock him off into thin air. He couldn't help himself. He adapted."
"Adapted!" said Joe, staring.
"Tried to adapt—to a form that would enable him to cling to his perch. That took the strength out of his tiger-fighting form, and I was able to get us both off the cliff together instead of being torn apart the minute I hit him. The minute we started to fall, he instinctively spread out and stopped fighting me altogether."
Joe sat back in his chair. After a moment, he swore.
"And you're just now telling me this?" he said.
Cal smiled a little wryly.
"I'm surprised you're surprised," he said. "I'd thought people back here would have figured all this out by now. This character and his people can't ever pose any real threat to us. For all their strength and slipperiness, their reaction to life is passive. They adapt to it. Ours is active—we adapt it to us. On the instinctive level, we can always choose the battlefield and the weapons, and win every time in a contest."
He stopped speaking and gazed at Joe, who shook his head slowly.
"Cal," said Joe at last, "you don't think like the rest of us."
Cal frowned. A cloud passing beyond the window dimmed the light that had shone upon him.
"I'm afraid you're right," he said quietly. "For just a while, I had hopes it wasn't so."
THE CATCH
Time to send the audience out on a light note. Or maybe not so light, after all. Just maybe, there are times when humans might wish that the aliens are the ones with the edge.
"Sure, Mike. Gee!" said the young Tolfian excitedly, and went dashing off from the spaceship in the direction of the temporary camp his local people had set up at a distance of some three hundred yards across the grassy turf of the little valley. Watching him go, Mike Wellsbauer had to admit that in motion he made a pretty sight, scooting along on his hind legs, his sleek black-haired otterlike body leaning into the wind of his passage, and his wide, rather paddle-shaped tail extended behind him to balance the weight of his erected body. All the same . . .
"I don't like it," Mike murmured. "I don't like it one bit."
"First signs of insanity," said a female and very human voice behind him. He turned about.
"All right, Penny," he said. "You can laugh. But this could turn out to be the most unfunny thing that ever happened to the human race. Where is the rest of the crew?"
Peony Matsu sobered, the small gamin grin fading from her pert face, as she gazed up at him.
"Red and Tommy are still trying to make communication contact with home base," she said. "Alvin's out checking the flora—he can't be far." She stared at him curiously. "What's up now?"
"I want to know what they're building."
"Something for us, I'll bet,"
"That's what I'm afraid of. I've just sent for the local squire." Mike peered at the alien camp. Workers were still zipping around it in that typical Tolfian fashion that seemed to dictate that nobody went anywhere except at a run. "This time he's going to give me a straight answer."
"I thought," said Penny, "he had."
"Answers," said Mi
ke, shortly. "Not necessarily straight ones." He heaved a sudden sigh, half of exhaustion, half of exasperation. "That young squirt was talking to me right now in English. In English! What can you do?"
Penny bubbled with laughter in spite of herself.
"All right, now hold it!" snapped Mike, glaring at her. "I tell you that whatever this situation is, it's serious. And letting ourselves be conned into making a picnic out of it may be just what they want."
"All right," said Penny, patting him on the arm. "I'm serious. But I don't see that their learning English is any worse than the other parts of it—"
"It's the whole picture," growled Mike, not waiting for her to finish. He stumped about to stand half-turned away from her, facing the Tolfian camp, and she gazed at his short, blocky, red-haired figure with tolerance and a scarce-hidden affection. "The first intelligent race we ever met. They've got science we can't hope to touch for nobody knows how long, they belong to some Interstellar Confederation or other with races as advanced as themselves—and they fall all over themselves learning English and doing every little thing we ask for. 'Sure, Mike!'—that's what he said to me just now . . . 'Sure, Mike!' I tell you, Penny—"
"Here they come now," she said.
* * *
A small procession was emerging from the camp. It approached the spaceship at a run, single file, the tallest Tolfian figure in the lead, and the others grading down in size behind until the last was a half-grown alien that was pretty sure to be the one Mike had sent on the errand.
"If we could just get through to home base back on Altair A—" muttered Mike; and then he could mutter no more, because the approaching file was already dashing into hearing distance. The lead Tolfian raced to the very feet of Mike and sat down on his tail. His muzzle was gray with age and authority and the years its color represented had made him almost as tall as Mike.
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