Mutt, followed shortly by Sammy and Nekomusumi, suddenly realize that the background noise isn't the white noise generator. It's gunfire. Quite a bit of gunfire, though muffled by the fact you're in an inside room with a decent door.
GM note: I am considering everyone but Mutt, Sammy and Nekomusumi surprised, effect being everyone else is restricted to ONE IP for this "turn". You are on the combat clock even if you don't fight just so I can keep things coordinated.
I know you all want a map now. I'm not where I can give you a good one. For now I'm attaching a quick MS paint diagram, and I'll upload a more detailed one tonight.
The room you're in is approximately 5m x 8m. There are no windows, no other obvious doors beyond the one you used.