"I wish you weren't here!" Sarah screamed. Since this was Sarah's second wish, it was granted to the nearest person, which was Jon.
Suddenly, she disappeared, leaving Jon alone in her bedroom.
Jon wondered why Sarah's wish was granted to her instead. Was there something wrong with the stone? That made things even worse, if outcomes of wishes were completely unpredictable. She had to find Sarah and get the stone back before she made another wish.
But where did Sarah go?