He's a celestial presence larger than a skyscraper folded to fit into Adam Milligan's six foot something frame. If there's something off about his posture, it's only to be expected.

Michael is in fact very comfortable in this vessel of his by now, after the decade (a thousand years and then some in Hell time) he's spent in it, and he's learned well how to express his moods with it. Being a little stiff and a whole lot impassive just happens to be what he wants to get across most of them time. It's who he is.

"Nothing of the sort, though I'd recognize my brothers."

They do have angel radio, a form of communication which might count as a handshake in the computing sense of the word. It's not exactly secret, though. It's rare they use it, and accordingly rare that they speak of it, but Michael is sure Castiel wouldn't hesitate to blab about their angelic communications network if someone were to ask the right question.

"A Greek demigod? You're not the first of your kind here, either. I'm surprised they haven't managed to summon more of you to Solvunn. You polytheistic types seem like just the sort of people they're hoping for."