Be sure to read the whole thing. And remember, Ability, Opportunity and Jeopardy.
One other thing to remember. If you ever have to shoot, do not talk to the police without consulting a lawyer. You can however recite the seven magic words, "I was in fear for my life". The old WWII saying should be your guide, "Loose lips sink ships". Officer friendly will be testifying for the prosecution and if you are lucky enough to live in a county like the one I do, you will be prosecuted. Don't be like the Texas fire fighter.