ijedi, the standard of force is different for that of civilians than that of police or military personell. (BTW, I’m an 91W in the Army Reserves and I just got assigned to the 5051st, which pleases me greatly.)
The average person only needs to prove that he/she did what a “reasonable person” might have done. That is, if a “reasonable” person felt that their life was in danger, it is reasonable that this person can use deadly force.
The interesting thing is that when you are really scared, you are not really “reasonable”. And the court often takes that into account. If you are a trained individual, be it police, military, (or martial arts instructor), you will be expected to be much more “reasonable” than the average Joe.
The devil is in the details, and it will be up to your attorney to prove that you were justifiably scared, and that what you did was in response to your fear.
Now, some states are different than others. Here in the great state of Texas, it is understood that if someone is tresspassing on your property it is likely that they are they to steal your property or do you harm and you are immediately justified in using force against them.
BTW, the law expects you to do one of two things to an assailant, either subdue and control the assailant and wait for the authorities to arrive, or kill him. Anything outside of those two things are likely to get you into allot of legal trouble.
A couple of years ago(good lord I can’t believe I’m dragging this out again) I dissarmed a kid that pulled a really crappy switch blade on me. I dissarmed him with my belt, and I ended up breaking the knife and damaging his hand. Even though I had several witnesses, including a cop, the court hassle was ridiculous and the guy got off without spending a single night in jail. I spent more time with the police than he did. But it still beat the alternative of doing nothing and risking him stabbing me.
JWT