I will do a little bragging and say I have unusually quick reactions. I can always grab the dollar bill before it drops between my fingers and very few can do that.
I do remember one time when I was a kid, playing cops and robbers and was holding my cap gun on a friend. He surprised me by grabbing it before I knew what happened.
For that reason, I will never let a threat any closer than I have to.
When I worked for Civil Service, we were given some very basic self defense training. Our trainer was a national champion is some types of Japanese martial arts which I don't even know what they are.
Anyway I remember him saying that he would not try to overpower or take a gun away from an opponent unless he was sure the guy was going to shoot. Now if a person is dumb enough to let someone with reach, then they probably would be too slow to react.
It all comes down to one thing... know what you are going to do before hand. Living in Texas, I am well within my rights to assume that anyone moving about INSIDE my domicile without my permission to be there is fair game. Get a clear eyeball on them, front sight post, steady squeeze.