When I taught shooting classes, I taught if ever involved in a defense shooting. Call 911 to report, when LE shows up the only statement to give is," I was in fear of lose of life, I stopped the threat, I want to speak to a lawyer." Say nothing else. Your brain will be racing at 1,000 miles a minute but your mouth can only go at 100 miles and hour, so you are not going to say what you think you are saying. This will give you time to calm down before you make a statement to the police, which will be used against you.