The Terrapin shook his dizzy head, and his narrow hawk face hardened. He pressed the pedals and sent the combat car rolling swiftly toward the spot that his practised eyes had marked accurately in the midst of the featureless desert. The black-and-yellow aero's nose was sunk deep into the loose sand that had slid down to partly bury the wreck, its blunt tail pointed into the cloudless sky it had left forever. One wing had been torn off and hurled yards away, the other was crumpled beneath the slanted fuselage. The terrapin slowed to a crawl along the crest of the nearest sandhill as its pilot surveyed the scene. But he was about to wheel away once more when he noticed the sprawled figure in bulky dark-blue flying clothes, that lay face down in the shadow of a brown drift. Deftly Torcred sent the terrapin careening down the slope to halt close to the motionless enemy. He hesitated briefly, then, shrugging, unsnapped his belt, wrestled open the almost-jammed door and clambered out. Dead or stunned, he had to make sure, and there was no harm in indulging a trifling curiosity. Under the remote blue curve of the sky, he shrank into himself a little. It was always so outside the steel shelter of the terrapin in which he had spent most of his days since childhood; he felt an oddly naked helplessness. But he looked down with interest on the body, his hand gripping the haft of the broad-bladed knife at his side. He had never before seen in flesh and blood a member of the lofty peoples of the air. As if roused, the limp form twitched a foot, shivered, and rolled over with a sigh. A pale face, closed eyes were upturned to the glaring sun and the startled gaze of the Terrapin. Startled he was, for the face was a girl's. She could not have passed twenty. In spite of the heavy coverall worn against the stratosphere's chill, and a wide strawberry mark where her left cheek had met the sandy soil, she contrived to be pretty. No more--but the terrapin women were brown and sturdy and coarse-featured, hardened by the drudgery of the camps. This girl's face was very white in the frame of dark hair that escaped the oversize plastic helmet. She breathed slowly and fitfully, and Torcred guessed at a state of shock; she might be badly injured. He shook off an unaccustomed indecision and knelt beside her. His face was unpleasantly hard as the knife slid from its sheath with a faint whisper, as he laid its thin edge along the exposed curve of the girl's throat, where a flutter marked the great artery. One quick slash, she would never wake.... But it was as if a restraining hand fastened on his wrist. Slowly he drew back the glittering blade and returned it to its place. He stood up and scowled down at the still, slight figure, brushing sand savagely from the knees of his heavy breeches.