One of the technicians was running and screaming. The magter knocked him down and beat him into silence. Seeing this the other two men returned to work with shaking hands. Even if all life on the surface of the planet were dead, this would have no effect on the magter. They would go ahead as planned, without emotion or imagination enough to alter their set course. As they worked the technicians' attitude changed from shocked numbness to anger. Right and wrong were forgotten. They had been killed--the invisible death of radiation must already be penetrating into the caves--but they also had the chance for vengeance. Swiftly they brought their work to completion, with a speed and precision they had concealed before. "What are those offworlders doing?" Ulv asked. Brion stirred from his lethargy of defeat and looked across the cavern floor. The men had a wheeled hand-truck and were rolling one of the atomic warheads onto it. They pushed it over to the latticework of the jump-field. "They are going to bomb Nyjord now, just as Nyjord bombed Dis. That machine will hurl the bombs in a special way to the other planet." "Will you stop them?" Ulv asked. He had his deadly blowgun in his hand and his face was an expressionless mask. Brion almost smiled at the irony of the situation. In spite of everything he had done to prevent it, Nyjord had dropped the bombs. And this act alone may have destroyed their own planet. Brion had it within his power now to stop the launching in the cavern. Should he? Should he save the lives of his killers? Or should he practice the ancient blood-oath that had echoed and destroyed down through the ages--_An eye for an eye, a tooth for a tooth._ It would be so simple. He literally had to do nothing. The score would be evened and his and the Disans' deaths avenged. [Illustration] Did Ulv have his blowgun ready to kill Brion if he should try to stop the launchings? Or had he misread the Disan entirely? "Will _you_ stop them, Ulv?" he asked. How large was mankind's sense of obligation? The cave man first had this feeling for his mate, then for his family. It grew until men fought and died for the abstract ideas of cities and nations, then for whole planets. Would the time ever come when men might realize that the obligation should be to the largest and most encompassing reality of all? Mankind. And beyond that to life of all kinds. Brion saw this idea not in words, but as a reality. When he posed the question to himself in this way he found that it stated clearly its inherent answer. He pulled his gun out, and as he did he wondered what Ulv's answer might be. "Nyjord is _medvirk_," Ulv said, raising his blowgun and sending a dart across the cavern. It struck one of the technicians who gasped and fell to the floor. Brion's shots crashed into the control board, shorting and destroying it, removing the menace to Nyjord for all time.