Read the rest of my comments. I said what happened does not necessarily exonerate the cop. But he was assaulted by Mr. Scott. If I assault a cop then flee, I have a reasonable expectation that the cop might shoot me. What do you think a cop might do after you've assaulted him? Blow kisses at you. Use your head.
Either you haven’t read Tenn v Garner, or didn’t understand it. The SCOTUS voided the preexisting common law “fleeing felon” doctrine, and said the fleeing person must still pose an imminent threat for deadly force to be justified in apprehending them. The real issue here is Slaver’s state of mind and factors contributing to whether he actually believed Scott to be a continued imminent threat.