Earlier that afternoon:
At home, Jon was worried someone had witnessed what happened. Anyone "within earshot of the wish" would be aware of the changes. What if someone had been close enough and it wasn't only himself and Karyn to have noticed the changes, or even had seen the branch change colors from across the courtyard. So he decided to wish for information.
"I wish, that an 8.5 by 11 inch sheet of paper would appear which has a list of everyone who witnessed Karyn and or me using the stone today."
Jon caught the paper in midair. And there it was, ominously, the list:
Jon Merlin
Karyn Scott
Sarah McMillan
"Well that's not good," he mumbled. He stepped into the bathroom and picked up the grody withered bar of soap from the shower in one hand, and still holding the stone in the other, said:
"I wish that Sarah McMillan would see and feel an illusion around this bar of soap, and think it is the magic wish granting stone, and if she makes a wish with it, nothing will happen to the real world, but she will hallucinate the consequences stemming from her wish as if it had really been granted, but what she sees will be all her delusion in her own mind, and it will continue until I flick her in the forehead, which will break her delusion and allow her to see things as they really are once again."
Back to now:
Jon went back upstairs to his bedroom, after intentionally leaving Sarah alone in it. He wondered if she had found it. He tried to make sure she saw him put the bar of soap under his pillow. Hopefully he didn't make it too obvious, but he wanted her to actually find the damn thing after all.
Jon entered his bedroom and there was Sarah, holding the icky bar of soap.
"Don't come any closer, Jon, I have your magic rock here, and I know what it does!"
"Oh no!" Jon said with convincing pretend fear in his voice. But he decided to run for a grab at the soap, just to make things convincing.
"I wish you wouldn't come any closer!" Sarah frantically said. Breathing and heart pounding fast, she frowned and stepped away from Jon's outstretched fingers, thinking she had just barely done it in time when the Jon in her imagination stopped just barely out of reach of her. Her anxiety over nearly losing control of the rock fading, her confidence boosted, she haughtily laughed, "Ha ha, you can't do anything against me now! It's time for me to have some fun with you. The one boy I could never control, and now I completely control you, what do you think of that Jon, eh? I can do anything now! You didn't know what you had here, playing around with it at school doing small time silly things when you could have become king of the world, you could have become a god, and look at you now. Ah ha ha ha!"
Meanwhile, while her imagined Jon was immobilized and stuck standing in one spot, the real Jon had already drawn 3 big kitty cat whiskers on each side of her face, as well as a silly-looking handlebar mustache above her upper lip ending on each side with a little swirl, with black sharpie marker. She was unaware of this, neither able to feel it, nor able to see the real Jon or anything he was holding.