This thread is walking right on the line of being on topic here. I can see no situation where an armed private citizen would confront an emotionally disturbed person. The proper response for anyone who does not have a duty to act is to disengage, not to put yourself in the position of the officer.
I respectfully disagree. Yes, the context of a LE officer dealing with a crazy nutball doesn't fit the average citizen who can just avoid it. However, the substance of the video absolutely applies to everyone!
I don't ever look at any violent video in context. I don't care about the "why" of it. I look at it from the cold perspective of violence; who is doing the violence and who is having it done to them? How can the one successfully using violence be more effective? (Just like a military AAR, no emotion.)
This video should be a wake up call to all the gun owners who think the simple act of having/pointing a gun at someone will make the bad person go away (maybe yes, maybe not!). This shows just how fast things can go south and how having a gun might not mean jack.
Forget context. If you opened your front door to a home intruder, even with a drawn gun, it could go down just like this. Round the street corner, boom, it's on (where is the citizen's partner?). Better to realize this and prepare, then keep practicing 2 hand stance, double taps, at 5-7 yds, standing flat footed ad-nausea...
Need to be able to shoot from retention (and seamlessly be able to flow from extended to retention), shoot while moving, strike effectively-before and after drawing etc.