Thanks for the replies. I admit that's an interesting decision to consider: 1) Leave BG on the ground, go to the door, and hope he doesn't resume an attack or 2) Carry BG and try to close a door with extra weight in your hands, with the possibility other BG's are coming back or just outside the door.
Apparently, the owner also posted his experience on Reddit and IG, perhaps making things legally difficult for later and now has a Go Fund Me. Yikes.