The stone glowed, but nothing seemed to be different. Chad was still himself and definitely not Julie. At least, that's what Jon thought at first.
"Oh my god! What the hell happened to my body?!" Chad yelled.
"Chad? What's wrong?" Jon asked.
"What are you calling me 'Chad' for? I'm Julie," Chad said.
Oh no, Jon thought, realizing what must have happened. While Chad remained physically himself, his mind changed to become just like Julie's. So mentally, he was Julie.