"Oddly enough, we've found the two are not mutually exclusive..."

Aziraphale laughed and mimicked Kira's maneuver. Even in this form it took him a moment to find his balance, but the wings (and a certain ability to bend, if not ignore, the laws of physics) helped him compensate. He didn't heal automatically, but in this state, he was only semi-corporeal and could close any ordinary wound with an instant's thought. All things considered, they should still be pretty evenly matched.

And then he leaped at Kira, and the contest began in earnest.