Anyways as to the fight, one problem is speed. Angel, at times, has shown insane speed, but he never uses it in combat. But somehow he can exit a vehicle in the blink of an eye without you even hearing the door close.
And he can do that whole "be in one place and suddenly he is in another" type stuff. But only one vampire I recall ever used speed in combat, it was Penn, the only vampire Angelus created. Yes, I remember all this lol.
So he technically has the capability to attack Cap before he can react. And he has enough damage soak to get tossed off buildings and get up pretty quickly.