An hour into the party, Karyn was already having a blast. By then, at least half of them were drunk and they didn't care. And that only helped their chances for having sex. Karyn never went to parties like this, so she never knew what it was like. And now that she did, she didn't want to stop.
She also discovered that, as time went on, she felt more and more important. She was the most important person at that party. How dare anyone say otherwise. All attention should be on her. Well, certainly Biff's attention was on her.
Jon was halfway through his movie when he started to worry about Karyn again. He decided that he would give her a call after the movie was over.