This really is the point at which the animosity between Angel and Xander was at it's height. Xander softened a tad in Amends but not by much.

I get the impression of Angel/Angelus' overdeveloped sense of their own importance mainly from Angel the series so it may not fit in the timeline of this story. Then again, Angelus believed it was his destiny to end the world by waking Acathla. How grandiose can you get? :)