Things I'd like to know about this case...
What was the shot guy doing...making threats, advancing towards the shooter, drunk, crazy, stealing stuff.
Where was the knife...in his hand, on his belt, on a backpack.
Where was the guy...next to the door, at a distance.
Why did he open the door and not just call the police to take care of it
Do they know each other?
A bad outcome would be if it was a regular chronic in the area with a knife on his belt and the homeowner said screw it I'll make him an example. Or at least that's what the prosecutor would say. Not worth shooting or getting involved unless your life is truly at stake and it's a last resort. Going to be very expensive for the shooter with the attorneys fees, civil lawsuit, possibility of losing his job, and strain on the family