I mentioned it in my main comment but at the campsite when I hit CTRL the gun shot. When I hit CTRL again it didn't shoot which made me think there was only one bullet. I was able to shoot the monster and after it was dead I went to Sprint back to my car I accidentally hit CTRL again shooting again when I wasn't facing the monster. I tried shooting from a distance but the game didn't allow it even when I hit CTRL and mouse click both sides. I saw one of the clicks was to aim but that didn't happen.