Actually yes, I'm so glad you asked!
I don't think Gabby's attacker was shot but he was brought down by bystanders, one of whom was armed.
Jared Lee Loughner - The New York Times
There's dozens of other such incidents, where a bystander was armed and took the bad guy out but I have to leave and can't look them all up, but YES it does happen.
And in this situation yesterday one man was saying he was going to try to take the guy down when the man was changing out the clip.
We (armed citizens) do not have to wait until the police finally arrive.
I personally believe that any average joes that are carrying are too busy running for their lives to actually enter into a gun battle with a maniac who is better armed.
You'd be wrong, at least in my case. My family is often with me when I'm out and about and you can bet if we all "hit the deck" because some gunman walked in, I'm going to draw my weapon and fire, if I can.
It's the same with taking self-defense classes. I do not want to be a victim, and if this is how it goes down, I won't be, or at least I'd die trying to save my kids and myself.
BTW, we live in an open carry state. We can carry unconcealed or concealed (concealed if you have the permit).
AZ is a "shall issue", so all you have to do is ask for one