sd--self defense
I got the badge to flash, but depending on the situtaton, location, etc, the one consistant thing i will do is call 911 and let them know the "who what when where"--especially who i am and a physical description of myself so it can be radioed to responders---so they will know for example the good guy (me) is the one standing wearing blue jeans, red plaid shirt, black cowboy hat, boots. Holding a badge or ID in your hand can't been seen or easily identified at distance----and nowadays long guns will probably be brought in so i don't want to get sniped by an officer at 50 yds.
I want the responders to have a good mental picture of who not to shoot upon arrival. Communiate the BG is down. Back off to a nearby location of cover/concealment just in case and watch the area from there--just in case the radio traffic does not get heard by every officer, and just in case there may be a 2nd shooter. By the way, the 911 operators will be probably flooded with calls so you may not get through immediately--watch your back. When confronted by officers--follow commands to the "T"---adrenlin will be running high. Depending on the situtation---i will be hidden and watching and when i come out of hiding to the officers, my weapons will not be in view, they will be layed on the floor before i come out.
Remember that there may be ten 911 calls ahead of yours and from a witness perspective, YOU may be a BG that shot it out with another BG. You in all likelyhood could be described as a bg by someone who still can't grasp exactly what has happened. There will be confusion to say the least.
This can be "what if" all day long to change things but in the end, it is up to you to decide how to protect yourself the best in the situtation you are in.