So if he punched you in the gut, you'd open fire on him?

I find it hard to advocate this, but I'm also strangely unsympathetic. Like, you could avoid the whole mess by not punching someone in the gut. This is sort of like criminals who get hurt or killed and then (they or their estate) sue. It's a shame the jury can't find the plaintiff guilty and cause the judge to remand for sentencing.