"You know who I am?" Color the angel deeply surprised. He's aware that Balthazar and Levi communicate with one another, but he wasn't expecting instant recognition. He laughs a little, regaining his composure. "Well, I suppose that saves me the trouble of telling you what I am and all that. It's a pleasure to finally meet you, Levi."

The differences are obvious, even to someone without angelic insight. Aziraphale shakes his head a little at the question. "No, I mean... I just happened to be in the area and thought to say hello, but there's no need to rouse him. Besides, this is your day to enjoy yourself, I wouldn't want to disrupt that." He peers at the open sketchbook curiously. "What are you drawing?"