Gabriel doesn’t speak to him for weeks.
The truth is, Michael doesn’t think he’s done anything wrong. Except, the silent treatment begins after Uriel’s birthday party and there’s a lot of the night that Michael cannot remember. And he’s anxious because Uriel texted him the next day with vague allusions to the Lord’s chosen doing unspeakable, drunken things.
Gabriel keeps saying nothing, ducks sideways when he sees Michael coming down the corridor and ignores the many texts and missed calls. Acts like they haven’t worked together for years, gone on many a-mission, fucking saved people side by side. Gabriel doesn’t even glance his way, ever.