Just to add a little to the legal end of this discuss,,,
when I took the pistol class over here a few years ago, the county prosecuter spoke to us, he said that you had to have the perception that the person was going to cause bodily harm or death to you or your family, not much was said about the definition other than that the word "perception" left a lot of grey areas, so in other words it is best to hold the story that you thought the person had a gun or weapon, or was going to kill or harm you or your family,,,