surviving an active shooter situation

[Pagan-Mist]

Strange this has come up, I was only a couple of days thinking if this happened what would I do, I do live in a small town but its could also be a large target if some nutter blew his stack. I've checked out all alleys and ways to get myself clear if this happens, but I don't know if I'd be able to leave injured people behind, I know I'm proberly going to get my head chewed off for that comment, but what if its a friend or family ?