Someone Runs Into Karyn

Karyn left Jon's bedroom and headed back to the mall. But as she went to open the front door to leave Jon's house, it opened right back out on her. Someone rushed through the door, and into Karyn, causing her hand to fly and the shaker in it to release some salt onto the person before her. Of course, what Karyn was thinking about at that moment was Sarah McMillan, or an idealized version of Sarah who was into girls, but who was it that bumped into Karyn, and upon whom did the salt of desire land?