Briggs slips in behind him. He positions himself on the other side of the door so if someone tries to come in he can slam his full weight into it. His listening for footsteps and watching Mike's face for cues.

The footsteps get closer and pause at the intersection. There's a voice speaking a one-sided conversation of 'yes, sirs.' The footsteps start up again, this time down their corridor. The one-sided conversation has stopped. The guard begins checking doors.

This prompts Briggs to take a quick glance around the room for cameras. And there one sits in the corner of the room. Briggs mouths 'fuck' before darting over there to disable it. It's a heavy model so he settles on obscuring the lens with his shirt. ...which felt incredibly good coming off and he's trying not to think about that.

Should Mike close the door, he'll find it magnetically locked.