I quoted this because I think it's one of those "our own worst enemy" issues that should be addressed.
First, at least as I saw, there's no way to tell the condition of the criminal as he falls. Did he still have the crowbar in his hand? If he's still armed and even theoretically capable of swinging (or throwing) the weapon to cause serious harm, it's perfectly legitimate to shoot him some more.
Second, even if we assume the crowbar was dropped somewhere during the second string of five shots, how long did that entire string of fire take from start to stop? Probably about a second. The officer's finger was literally moving the trigger faster than his brain could process information. Thus it's perfectly understandable that he may have fired a round or even two after the threat was neutralized. Sure, if we go through the video one frame at a time it's easy to call "STOP!" on a dime. Once we know approximately when the threat will be neutralized it's easy to watch for it and judge the stopping point, as well. But the officer in question had absolutely no idea when or even if the threat would be neutralized and therefore had to make his assessment while still in the process of shooting. In other words, he had to shoot and assess simultaneously.
Have a friend who's never seen the video watch it from the beginning. Tell him that shooting will begin and he needs to hit the mouse button to stop the video when he thinks the threat is neutralized. Does he stop too soon? He just endangered everyone. Does he stop only after one or more extra shots fire? I'll bet so.
To me, the video demonstrates the value of high capacity pistols. No matter what caliber you're strapping, it's going to take a certain amount of time to affect the BG. The officer in this case essentially "stun locked" the BG (it's a computer gaming term... trust me, it's applicable here ) through volume of fire, keeping him from attacking for a couple of seconds until all those little lead pills had a chance to take effect.