The red light was glowing now. As Ronson stared, it winked out. Before he could take his eyes away from the dial, the red light flicked on again. The super-sonic note came with it. A flick of very real pain came with the note. The red light flicked out, the note vanished. The pain was gone. "Regular pulsations of radiation are being poured through this place!" Ronson whispered. It was being done deliberately. The whole cavern was being flooded periodically with bursts of radiation. This meant deliberate intention, purpose, plan. He did not know what impact this radiation might have on Martian flesh but he could guess the effect it might have on human tissue. Fear came up in him, a flood of it. Anger followed it. The lights on his watch danced. Pain, agony, and the shrill note of the super-sonic came again. Grimly, he began to prowl the cavern, searching for the source of the radiations. The radiation counter in his watch led him to it, by the increased intensity of its glow. The radiations were coming from a single spot in the wall of the cavern. So far as he could tell, the wall was solid stone at this place, but he had seen solid stone walls dissolve in this madhouse. Behind this spot there was intelligent direction of the bursts of radiation. Back there Les Ro, or someone with him, was playing games of life and death with-- Te Hold came past him, screaming. The Martian was beginning to stumble as he ran. The screams were only gasping sounds in his throat. Voices rose in shouted argument somewhere in the shrubbery. Ronson moved away. "What's going on there?" he asked the leper. "Tal Bock--and Kus Dorken--have disagreed--as to which is the bigger killer--and therefore which is the more worthy. They fight--to decide the problem." The words were quietly spoken. The tone said the matter was of no importance. After he had finished speaking, the leper's eyes went back to the inner ecstacy that he seemed to be watching. Or was it _future_ ecstacy that he was imagining? "I hope there is a heaven for Martians," Ronson said. So far as he knew, only in heaven could this leper's health be restored. Was the same true for him? Voices screamed in the shrubbery. Giving ground before the heavy blows Tal Bock was striking at him, Kus Dorken came stumbling backward. He slipped in the sand and fell heavily. Tal Bock leaped at him. Kus Dorken screamed once, a sound that gasped into silence as Tal Bock's fingers closed over his throat. For a time, they threshed in the sand. Then Kus Dorken went limp. Viciously Tal Bock slapped his foe across the face. When there was no response, he poured sand into Kus Dorken's mouth, scooping it up in handfuls and cramming it down his foe's gullet. Tal Bock got to his feet. The scream that ripped from his lips was pure triumph. Utterly naked, he stood beside the body of his victim, shaking his fist at the roof of the cavern, screaming defiance at the universe.