As Jon walked away, he muttered "I wish I didn't have to do this." But again, instead of being granted to him, his wish was granted to Sarah instead. Another link in the "wish chain".
One moment, Sarah was walking her dog. And the next, she wasn't. Because she didn't have a dog. Not anymore. Not in this reality. She was outside because she was walking to her friend Tiffany's house. She wanted to show her a few new dance moves she wanted to try out for cheerleading. Since Sarah was the head of the squad, she was the one that coordinated all the routines.
Everything was going well, until that loser attacked her, babbling on about some stone that he lost. But she dealt with Jon the way she dealt with everyone. By making them do things for her, in exchange for favors.
Changing her thoughts back to her visit to Tiffany's house, she muttered "I wish ..."