IMO, there is only one reason anyone would flee the scene of a shooting. Not wanting to be caught because they did something wrong. The news is full of stories like this, whether it be hit and run, a shooting, a robbery etc. I can't tell you how many times people have dropped off a friend who had been shot at the entrance of the ER only to drive away. The patient was typically dumped out of the car and we had to go out with a stretcher, pick them up and place them on the stretcher and into one of the trauma rooms.
Dunn had nothing to gain by sticking around to answer questions. He had not formulated his story yet. He is an irresponsible gun owner and person and needs to be in jail for the rest of his life. Nobody gets to do what he did and get away with it. JMV