Clearly a bad shoot. The cop new it right when he killed him. The weird thing is that Philando told the cop that he had a gun on him, so you would figure from him informing the cop that he wouldn't try to sneak attack the cop, but the cop repeated multiple times "don't reach for it" "don't reach for it". What was Phil reaching for? We can't see from this angle, but if it was his gun than it was a justified shoot. Really a tragic situation, and the cop is gonna live with that on his conscience for the rest of his life. I don't think he took any malicious pleasure in killing Phil, you can tell by the anguish in his voice afterwards.