Agreed if they identify him they will charge him. The final shot to the head after he was clearly neutralized makes it impossible to not face charges.
However unless the prosecution could show this man had a pattern that makes him a threat to society, if I was on the jury I would nullify regardless of what the law says.
Clear of a case for jury nullification if there ever was one.
Self defense and he just got carried away, emotionally.
No reason for him to contact law enforcement since he didn’t commit a crime.
I believe the Hero, who was also a victim was in a state of Shock/Fear when he fired the shots including the last one. With the faces of the other potential innocent victims running thru his mind he was paralyzed by fear and concern for their lives. At that moment an instinctive survival mode took over coupled with Fear/Shock and he sprang to action.
This man is a Hero.
NONE of us are “Professionals” in knowing ‘when the threat is over’.
I would rather err on the side of caution-—and BE SURE.