In an armed confrontation (remember the perp was armed) you think 'legality' is anywhere in someone's conscious? I'm going to try and kill the SOB as long as he's in range.
It's easy for us, safely at a keyboard, to quote the law and prudent for us to do so. I'm simply stating what is a very believable reality for me. I just don't think I'd be anywhere near as 'rational and delberate' as some claim we need to be. Again... I'll just pray my remaining time on earth was like it has been to date and no such scenario ever gets tested. The 'best' scenario is still an absolutely nightmare.
But the more you understand what you can & should do the faster you can process what's reasonable.
I agree that in a life or death situation you will react & do what you have to do (hence the old training adage, "you can't form a plan in the middle of a fight".
However you will have a distinct advantage if you know the laws & have trained yourself on how to respond to various situations including home invasions.
I understand that you are fiercely protective of your family.... most of us are.
The trouble is that so often there are examples of good people who were so enraged that they let that anger cloud their judgment & went out seeking revenge & then jeopardize not just their right to own a firearm but also their freedom or incur huge legal fees over (sometimes) a simple lack of knowledge of the law.