Ohhh - misread your post. Thought you were the one going outside for a smoke break.
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I figure the thread is already good and derailed, so might as well throw this in.
Turns out you can still snap your fingers to whatever rhythm is in your head despite having two bullets in your forebrain.
Perhaps I'm not understanding the nuances of your question. Understanding the laws of your State and how your courts of appeals interprets them (case law) is worth a class all by itself. IMO, the answers to those questions have absolutely nothing to do with how a gunfight happens. They just matter on when it starts. You either have legal authority to use the force or you don't. You have to answer them and have to use those answers to make your own personal mental triggers on when and how you are going to start the use force.
When to stop using that force then depends on when those mental triggers are no longer present during the gunfight. The only thing about a gunfight that would play into this is if you can't see or hear a piece of evidence due to the dynamics of the fight itself. ie do I need to shoot until the subject drops the gun and then stop and can I even see the person drop the gun while focusing on high center mass during that two seconds window? Do I even want to focus on anything else?
There are a few of those threads that take that issue down to the geek level. Perhaps someone with better Googlefu will suggest them. I believe the last one was "When to stop shooting" or something similar?
When do you stop shooting? When you are out of ammo or when the threat is gone.
"Shoot to the ground" is an excellent way to set yourself up for overcoming a threat.
Find a vital area and shoot that area until the threat is on the ground. If after several rounds that threat isn't falling move on to another vital threat.
I will always shoot for switches first but will settle for timers so long as i have the advantage.
When in doubt eyes, high aortic or dick shots will put people on the ground.
The following article from Police One and Dave Spaulding's FB page is a good illustration of many points brought up here I think. It was a good and a short read.
https://www.policeone.com/police-her...mo-on-the-job/