Did you watch the video? Scuffle is not the word I would use.
Cop asks him to take his seat belt off and opens the door (he remained calm in professional), perp pulls the door closed, puts the key in the ignition and puts the car in drive.
Cop pulls out his gun and shoots the fleeing suspect.
This. However, I'll go with manslaughter, there is no pre-meditated intent here to make it murder. He fires when the driver starts the car and put it in gear. Watch the video closely. DeBose is putting his right hand to the key at the same time as he pulls the door closed with his left. The car then starts, and the reaction begins, followed by the shot. The gun is not out when the car is started, but the officer well and truly over reacts by drawing and shooting. I can understand that having a car drive off on you when you are right there is dangerous, but going to a gun, no, too much. He should have backed off, headed back to his car and chased the guy down.
Having said that, the driver isn't totally innocent. He was in the process of running for no apparent reason. If he was suspended, so what? It's a ticket, big deal, running isn't worth your life, or someone else's.
This is, IMO, another result of the US's gun culture. USAers go for their guns far too fast, and not just the cops, the public do it too.
However having said that, it's still not reasonable to fear for your life when pulled over. These incidents are a fraction of a percentage compared to the number of interactions and traffic stops that occur peacefully and without incident every single day, even between White Cops and Black drivers.