The real mistakes are legal issues...and ones that I disagree with, but the law is the law.
1) Once you engage someone, you never EVER chase them (unless, I suppose, they snatch up your child or something which forces you to pursue etc.)
2) Now if they started shooting back, and were doing a retreating gunfight...perhaps you could legally pursue them, at that point you're protecting other people.
3) Never EVER shoot someone who's sprawled out on the ground, UNLESS they have a gun and are aiming/shooting at you or someone else.
The main issue here is the same one which ends up with a lot of home owners getting in trouble. You get amped up, and next thing you know, you're chasing a home invader through your lawn, shooting him in the back. Remember, only when threatened with imminent serious bodily harm or death may you use a fire arm in self defense. Once that threat diminishes (guy drops gun, turns around and runs, etc.) you MUST stop shooting.
Some people chase home invaders out of the house, and into their car, and they end up in the street emptying their Glock into the car as its speeding away etc. This is exactly how you get sued/arrested/charged.
Unfortunately when the shooting starts, you immediately get amped, and often lose sight of what you can or cannot legally do. I really hope none of this comes back to bite this guy.
