My goodness, if you walk with a cane and have a handicapped parking permit, you are not expected to be able to run away. That's just common sense, and that is exactly why there is a disparity of force excuse in the law.
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Ayoob says, "The only true success is avoiding a situation, anything else is just damage control" There is a lot of truth in those words.
Those who are looking for some sort of "gurantee" that they won't get in trouble for doing what they do, are in the wrong club!
Excellent post by Bark'n. I'd add this--if you draw (and especially if you fire), "there's gonna be a reckonin'." You WILL have to explain yourself to the police, and very possibly a grand jury. (BTW, keep in mind that drawing a gun and pointing it at someone is, by definition, assault w/ a deadly weapon.) If there's any doubt surrounding your draw/fire, then it's the wrong move. "I had no choice" is the standard you must meet. If you're young & fit and carry a gun but don't know anything about unarmed combatives, here's how a prosecutor might approach you:
"So you decide to protect yourself by carrying a gun?"
"Yes."
"How else do you protect yourself?"
"I don't understand the question."
"Well, carrying and using a gun in a confrontation is the ultimate fight stopper. What other method could you have employed to protect yourself and end the fight?"
"I'm not sure" (now you're dead)
"Did you ever study any kind of martial arts?"
"No."
"If you had, wouldn't you have been able to defend yourself without resorting to firing your gun?"
"I don't know."
"So anytime you feel threatened, you're automatically going to draw and fire? "
"I had no choice."
"Didn't you have the choice whether or not to learn other methods of stopping a fight? Didn't you choose to carry a gun without knowing how to handle yourself in a fist fight? Didn't you choose to only have the most extreme option available to you for every altercation?"
You can see where this will go, and it
will not go well for you. If all you have is a hammer, everything becomes a nail. If you're physically fit, carry a gun and nothing else, you better know how to handle yourself with just your hands or the prosecutor will serve you up on a silver platter. Your only reasonable alternative, as I see it, is to carry OC as well. Have some kind of force spectrum available in your tool box so that when you're in court you can explain why the lesser-force options either failed or weren't equal to the threat.
But as Bark'n said, for those for whom it would be impractical or impossible to learn how to fight, there is the disparity of force exception, and a jury will be sympathetic to a 60-something shooting a 20-something, as long as the 60-something can articulate why he/she felt threatened. You'll be home free.
To the OP--glad you came out ok and that the knee worked out (and I'm sure you're willing to admit that there's some beginner's luck involved). Time to get some fight training, even if it's just sparring with a friend, duplicating the techniques you see on UFC (though I'd recommend being VERY careful...scratch that, don't do it--get trained). Put
something in your tool box that doesn't go bang and throw hot lead. That way, when your gun does go bang you can explain why with some level of confidence that you did the right thing.
"You are trained in martial arts--"mixed" martial arts?"
"Yes."
"So why did you feel the need to shoot him?"
"Because he's Tito Ortiz!"