Dog Senses

Each time we passed a room, Grue, Regent and I would double check it.  The first few were empty, but as we reached one room, a dog took notice, and Grue raised a hand to plunge the room into darkness.  A second later, he stepped back into the hallway, twisting the arm of a cringing thirty-something man in a gray suit behind his back.  I hadn’t even realized Grue had entered the room in the first place.