Update: I take it back what I said. I found another video [2] that clears the picture. The guy wasn't running away from the shooter, he was chasing the shooter and throwing something at him. He then kept running after him and the shooter turns around and shoots him. The confusing part is that she shooter is shown coming from behind after the shooting happened. But it's because he goes around the car after the shooting and comes from the other side. I now believe all the shooting he did that night was self defense. He wasn't supposed to be there and play police but that's a different story.
[2] https://www.youtube.com/watch?v=bmji3EVxqLM