As the other Jon drove, he turned onto Karyn's street. "I'm picking up Karyn," he stated. It wasn't up for negotiation.
But the real Jon didn't care where they were going. All he cared about was getting the stone back.
And when they stopped at Karyn's house, Jon decided to make his move. He certainly didn't want to stay as his sister any more than he had to. As far as he was concerned, he had already been in her body long enough.
As they waited in the car for Karyn to come outside ...