He does not shoot through the door, and when it opens, there's no one there. I've checked it multiple times. He can't be in the building because he is obviously, as the video shows, not in there with me. He also cannot shoot through the windows because there's no way to climb a roof in VMC where it would be possible to look through that windows of the barracks. Additionally, there are no gunshots and subsonic cracks heard, so he has to shoot arrows or subsonic ammunition and use a silencer, but I would have still heard the shots, if he was close. And the crossbow does not have such a high rate of fire.