There was a dangerous shootout in the Inkster incident, with the guard shooting once through the wall at waist level (but maybe he’d seen that the others had gotten down on the floor). The robber had shot first at the guard, and the sight of the guard’s rifle may have been what caused him to turn and run instead of finishing him off. The AR-15 may have saved the guard’s life.
Actually, the guard was shot by the perp.