I vote one for the cop. A knife can be just as deadly against even a firearm within even several yards (no, probably not with the old lady though). But at that close distance, even with the old lady, chances are very well there of being stabbed, even if only accidentally. The woman refused to put it down, then appeared to struggle a bit (cameraman fail @ running closer at that exact moment), and the cop quickly acted to neutralize the weapon to both protect herself, and who knows...even that same elderly lady. We can all play the "what if" game here, but that will accomplish nothing. Obviously the cop didn't take her as too much of a threat since she moved right on in to try to take the weapon, then realized she had to take her down. No real chance of death involved (taser => pacemaker...etc). Now if the cop would have done something more while she was on the ground, then I think there would be a controversy here, otherwise, no. Just my 2 cents...