Mikey realized that when he had zapped Miss Warren and given her a biker's head, everyone--even the people who were there and saw her transform--thought she was always like that.
So if he zapped Jon to show Ricky, Ricky wouldn't think anything's wrong. He wouldn't even know Jon had been zapped.
"Hold on," he said, and left the room, then got out the stone. "I wish that this gun has another setting, so I can pick whether people think it was always like that, or not."
Then he returned to the room with doll-Jon. "Here's the trick," he said, firing at the doll....
