Raf dodged around the door and flattened back against the wall of the room beyond. The moving bars of sun said that it was midday. But the room was empty save for the despoiled carcass, and there was no sign of the aliens who had been sent out to scout. The Terran ran lightly down the narrow room to the second door, which gave on the lower pits beneath and the way to the arena. As he took that dark way, he drew his stun gun. Its bolt was intended to render the victim unconscious, not to kill. But what effect it might have on the giant reptiles was a question he hoped he would not be forced to answer, and he paused now and then to listen. There were sounds, deceptive sounds. Noises as regular as footfalls, like a distant padded running. The aliens returning? Or the things they had gone to hunt? Raf crept on--out into the sunshine which filled the arena. For the first time he studied the enclosure and recognized it for what it was--a place in which savage and bloody entertainments could be provided for the population of the city--and it merely confirmed his opinion of the aliens and all their ways. The temptation to explore the city was strong. He eyed the grilles speculatively. They could be climbed--he was sure of that. Or he could try some other of the various openings about the sanded area. But as he hesitated over his choice, he heard something from behind. This was no unidentifiable noise, but a scream which held both terror and pain. It jerked him around, sent him running back almost before he thought. But the scream did not come again. However there were other sounds--snuffing whines--a scrabbling-- Raf found himself in the round room walled by the old prison cells. Stabs of light shot through the gloom, thrusting into a roiling black mass which had erupted through one of the entrances and now held at bay one of the alien warriors. Three or four of the black creatures ringed the alien in, moving with speed that eluded the bolts of light he shot from his weapon, keeping him cornered and from escape, while their fellows worried another alien limp and defenseless on the floor. It was impossible to align the sights of his stun gun with any of those flitting shadows, Raf discovered. They moved as quickly as a ripple across a pond. He snapped the button on the hand grip to "spray" and proceeded to use the full strength of the charge across the group on the floor. For several seconds he was afraid that the stun ray would prove to have no effect on the alien metabolism of the creatures, for their weaving, tearing activity did not cease. Then one after another dropped away from the center mass and lay unmoving on the floor. Seeing that he could control them, Raf turned his attention to the others about the standing warrior.