His other hand gripped her arm.
Larry leaped from the bed and attacked, beating futilely on the metal body with his good arm. The robot brushed him away with a light shove that sent him sprawling across the room. He screamed as his broken arm twisted in the fall.
Again the robot gripped Stella's forearm with both metal hands, and bent carefully, slowly. Her mouth opened wide, and a shrill scream of pain erupted. The robot's hands twisted abruptly. The arm bent visibly, then angled sharply halfway between wrist and elbow.
2615 released her and stepped away. It surveyed what it had done, silently. Still silently, it strode to the door and went out. Two young men with quiet smiles entered the room.
"Your arms are broken?" one of them said sympathetically. "Think nothing of it. We will set them so expertly that in a few weeks they will be as good as new. Please come with us to one of our laboratories. We will have to examine the fractures by X-ray before we try to set the bones. It should prove interesting ... to us...."
On the travelwalk back to the grav-cylinder Pwowp regarded 2615 thoughtfully. "I doubt if they could stand much of that," he said abruptly. "I had expected skin abrasions. Bruised flesh."
2615's lens eyes regarded him without expression. "There was a purpose," it said. "Today they would have begun their plans for escape. Humans are very clever. Now they will be thinking of other things. It will be two weeks at least before they can think of escape."
"And the torture you plan for tomorrow?" Pwowp asked.
A deep rumble sounded. "Tomorrow they will wait for me in vain. The terror of anticipation. It will be enough."