The only reason Rebecca was there was because Evan had insisted. She was painfully aware of his continuing feelings for Emily and hadn't wanted to get in the way of his leering. Yet that is exactly what she was doing, even if she hid her frustration with him, just moving to the steady beat of the music.
"Nothin', mate." Back to 'mate' it was, then. At least for the time being until Evan actually started really treating her like his girlfriend. She glanced back at Emily, trying to catch the other girl's gaze because it would probably be more fun to dance with her than it was to dance with Even right then. At least Emily seemed to have everything together.