That's hardly what I'd call "awkward angles" the Angel's are rushing her from several but linear directions, up, down, left and right. Vash can shoot down several Vodka bottles
inches away from ssomeon's head while drunk to the point where he can't even stand properly.
Again these aren't awkward angels, they're behind her and that's where she fires, and they aren't that far from her either so hitting them wouldn't be much of an issue. Vash can intercept and parry an attack from Knive's Million's who spawned his attack directly underneath Vash, and attacked him omnidirectionallly at nigh
point blank range and Vash shot down every single one without them touching him. Knive's also attacked him with Angel Wing's which have Instinctive Reactions which Vash casually yeeted.