Best case he gets a lucky shot and ends it, more probable would be him drawing the gunman's fire, which would stop him from spraying the entire @#%^ing theater.
That wouldn't be a lucky shot. That would be a miracle
. It doesn't matter how calm you are, you're still in a theater with hundreds of other
people panicking; Running and screaming and bumping into each other and into you. You're also in an extremely dark room with tear gas in the air. Most likely not enough to incapacitate you, but certainly enough to irritate your eyes and skin. And your target, in that dark room, is wearing dark clothes. Not a huge problem in a vacuum because the gun muzzle certainly is bright enough, but couple it with the other factors and the fact that he's gotta shoot first before you can get a bead on him and hope you can calculate well enough to hit him. Also most people don't really carry heavy duty pistols when they have a concealed carry permit, which means they're not exactly known for their dropping power. Here's some hindsight as well: The gunman was apparently wearing a ballistic vest and helmet.
I'm sorry for your sister but get your head out of your *** if you think that someone carrying in that theater would have magically ended the rampage. The most likely
outcome would have been he'd have at best
injured and panicked the gunman into spraying the entire fu
cking theater even more.