It's tough to call from a short video without knowing all the facts but I can tell you this, it's hard to convey what it's REALLY like out there when someone decides to face off with you. I've been in my share of fights in the middle of the night with dangerous people. I'm not real fond of the initial tactics displayed by either officer in that video, but that doesn't mean it wasn't a justified shooting.
It's easy for everyone to say that you would just easily subdue the suspect if it were you, but when you are face to face with it, it becomes serious and if you don't win, you don't go home alive. That changes everything. I've been there.
This next opinion probably won't be very popular in this day and age, but I don't feel that there is a real place in law enforcement for females. Despite what is portrayed in all of the television police shows, in a LARGE percentage if instances in the real world, they can't handle themselves in a fight with a determined male violent criminal. Nothing against women...it's just a fact. Thry react differently and are at a physical disadvantage in these instances. Thus courts have upheld that they are justified in using a higher degree of force than a male in the same situation.
Additionally, as a law enforcement officer, if you feel that a suspect is attempting to obtain your firearm, or is attempting to render you unconcious, you are absolutely justified in using deadly force. You are also not obligated to use your hands just because the suspect is attacking you with his hands. He could be a trained MMA fighter for all you know. It has already been stated, but this suspect made a fatal mistake by squaring off with the officers instead of fleeing.
These incidents usually take place in a matter of seconds when split second decisions must be made. Hesitation can get you killed. We have the luxury of studying the incident on tape over and over again without being under the stress of the instant.