Jon had trouble moving his body with no legs. But he managed to arrange himself at a slightly improved angle, so he could get a better aim. He couldn't see his own legs from here, but he could see Tammy. She was his goal originally anyway.
It was now Tammy with cake attached to her torso. Jon now had Tammy's legs and clothes from the waist down. He couldn't believe how strong, toned, and shapely they were. He got turned on and felt himself get wet.
He'd have to fix Tammy later. But as he made his way back out the door, he noticed his legs on the table. The couple had really eaten into them. He wasn't sure if he'd be able to give them back to anyone! The scene was particularly disturbing as Pete and Tammy had blood smeared on their mouths. He had inadvertently made his neighbors cannibals (at least in some sense).
He'd have to use the stone, but he realized he hadn't brought it with him.