Sarah Palin famously said, "Don't retreat. RELOAD!"
While the Tucson shooter was reloading, a woman, herself wounded, attacked him and grabbed the magazine. Two men then jumped on him and it was over.
That woman and those men were brave citizens who saw what they needed to do and did it. Kudos to them. We would all like to think we would have done that and pray God we never get the chance to find out.
About getting shooters while they reload: Be careful. During WWII, Wehrmacht soldiers quickly learned to rise up and shoot when they heard the distinctive "ping" of an M-1 ejecting an empty clip. That worked until the GIs figured out to have a second man with a full clip ready to greet them.
One armed law-abiding citizen in that crowd could have nipped it in the bud and prevented most of this. Given Arizona's permissive carry laws, I'm a little surprised there wasn't one. There would have been at a Repug rally, but nobody would have been shooting at them.
Possibly the most adult person in this so far is Sheriff Dupnik of Pima County. He was the first to bring up the hateful rhetoric that led to it and condemn it. Kudos to him as well.