Inside or outside, just saying that sometimes things don't go like you think they will.Are we still talking about shooting intruders in a home?
Everyone wants a "bright line" in the law, a clear interpretation, but especially in cases where violent force is used questions will be raised.
Everyone should do what they need to do protect themselves and the people under their protection but it behooves the protector to make sure all their I's are dotted, T's are crossed and ducks are in a row because there will be questions. As an example, a bad guy fires his weapon and makes a 180 degree turn, that happens in less than a second. That means if you return fire at that turning bad guy you now have shot him in the back and it will appear you have shot a person who is trying to escape, that will raise questions. Will it be enough to get you charged, dunno, neither does anyone else until it crosses the Prosecutors desk.
From Force Science Institute,
“As expected, all three ‘time-to-shoot’ motions were much faster than a person could react to the shooting, draw, and fire their own gun. After discharging their weapon, the subjects were able to turn their backs toward the target in under 1 second, regardless of their starting position or shooting motion.