Once the waitress left, Bourne went into stake-out mode, observing the diner and its occupants just in case he might need to know later. It was automatic, a longstanding habit that he found too useful to bother trying to break, and considering it had gotten him out of a bind more than a few times over the years he saw no reason to change it.
When he spoke his words were aimed at the girl sitting in front of him, even if most of his attention seemed elsewhere. Not the most encouraging of situations perhaps, but he'd never bothered much with small talk skills, so it didn't phase him that it might not be appreciated. The mocking tone probably didn't help much. "What gave you that impression?"