Since that nasty shot in the head you took, Boone's been questioning your ability to shoot a gun. Usually you just used melee, but in the few times he's seen you shoot, you've been absolutely awful with your aim. Now he was shoving a rifle into your hands before taking a step back and folding his arms. "Do you know how to use it?" Without thinking, you hold it up and aim it at him. He lightly pushes the barrel away from himself. "Do not aim it at me." You then turn it on yourself and look down the barrel for no other reason other than curiosity (at least, that's what Boone hoped). "Do not aim it at yourself either."