Since Angel has demonstrated only a desire to help, her emotionless monotone doesn’t really bother him. It actually makes her seem interesting and cool, like she’s real deep. He respects that. He takes a moment to think about her question, but doesn’t have an answer.

“I don’t know.” He’s ill-prepared for such a conversation, having not had enough time to fully process everything. Although he obviously has thought about it some before, he never reached any definite conclusions, and at the time, he was unreflective in a way that seems shocking to him now. “Guess I wasn’t really thinking...”

That, of course, seems to contradict what he said earlier about knowing it was wrong. Humans can be such frustrating transmitters of data when it comes to their own psychologies. He looks away, taking a drag from his cigarette, and mumbling something about being unprofessional.