Jonner's rocks were a better weapon than a heat-gun, Kraag realized. They weighed only a fraction of an ounce and Jonner could fling them an amazing distance. But their mass was just the same as ever, and a jagged one could rip a fatal hole in a spacesuit. He had no intention of engaging in a stone-throwing duel with Jonner, in which Jonner would be at least on equal terms with him. On the other hand, it was even more imperative than before that he eliminate Jonner as soon as possible. A rock could be a deadly weapon if Jonner got inside the sphere, too. At any rate, there was no point in concealing Stein's body from Jonner any longer and Kraag couldn't take chances on it polluting the atmosphere of the sphere. He dragged the corpse from the food compartment, down to the airlock, and pushed it out onto the surface of Ceres. The body settled stiffly to the ground a few feet away. Kraag removed his helmet and hand-hooks, went back up to the control room and settled himself to watch Jonner. Jonner walked around freely, periodically hurling rocks at the sphere. The rocks bounced off without damage, but every time one of them hit the hull, the sound of it rang through the sphere. Kraag switched on the communications system. "Do you have to do that?" he demanded in irritation. "It's not doing you any good." "Keeping me in practice," replied Jonner cheerfully. "I developed a pretty good arm throwing grenades in the Charax Uprising." Jonner was a veteran of that brief but savage war on Mars, and sometimes reminisced about it. It was there he had developed his preference for the old-style projectile pistol over the heat-gun. * * * * * Kraag's eyes lingered on Jonner's pistol, hanging in the rack with the heat-guns, and slowly an idea spread through his mind. The heat-gun range was the same anywhere, but the range of a projectile weapon should be greater here than on Mars or Earth. Its range should be far greater than Jonner's rocks. Kraag took it from the rack and turned it over in his hand, studying it. He wasn't sure of its principle, but thought it was something on the order of rocket fuel. It should fire without an atmosphere around it. There were some figures stamped on the barrel: "COLT 1985, Cal-.45, MV-1100, Ser-45617298." Kraag puzzled over them. He knew the first one was the make and year and the last undoubtedly was the serial number. He deduced that "MV-1100" probably was a figure showing the relationship between the projectile's mass and velocity. But it had been a long time since projectile weapons were common.