That briefs well in a vacuum but you're ignoring that they did not know he was unarmed. All they knew is that he had fired a shot (likely intended at them but the video of the chase it looked like he just kind of stuck the weapon out and shot) and was now on abandoning his vehicle, failing to obey orders and was fleeing on foot (presumably with his weapon in tow). They had every reason to believe he was still armed. In the world of policing, presuming he wasn't armed could have gotten at least one of them wounded or killed. So you can see why they treated him as if he was armed when he turned around.
L_Ratio_Cope posted...
I like how you can remove the unarmed part of my post and still come up with the same point you are so egregiously missing.