Get real. This isn't a cheesy 1970s made for TV movie.
Most defensive uses of firearms are not reported to police, even most cases where shots are fired, which happen in about 5 percent of the cases.
Don't try to tell us that normal people merely get the girlfriend in the car and then go to a motel room, and hope that the cameras and witnesses didn't get our information.
Is Dunn claiming that the shotgun was fired at him???