Since I don't feel like multi-quoting and responding point by point to the comments directed at me, questioning my thought process, I'll just say, I am very pro RKBA, and pro self defense. That being said, it also appears I'm the only one man enough to admit that I ain't Rambo. Whole lotta arm chair quarterbacking from the mall ninjas who think that they would somehow be impervious to the tear gas, that they would be able to make sense of what was going on when one second you're watching a movie, and the next, you're coughing and can't breathe or see through the cloud of tear gas. That despite all that, you'd actually be able to focus enough to pick out the gunman amongst the panicked crowd running around you trying to flee. That you'd have the wherewithal to crawl through the tear gas cloud and get a clean angle on the gunman during all the screaming and gunfire going on around you, and actually focus your sights on him in the dark, with your eyes closing because of the tear gas. Sorry, but reality can be a hard pill to swallow.
To think this guy didn't expect any armed resistance is crazy. He wore a freakin bullet proof vest and riot helmet. He fully expected someone to shoot back. So, If you wanna call me a wuss for realizing and admitting that scenario was something that would be challenging for a highly trained operative, much less a simple law abiding armed citizen enjoying a movie, then have at it. Enjoy your fantasy where you'd be the guy that saved the day and made national news as the guy who stopped a massacre. Reality leans more to you just ending up in a body bag like the other 14. You can debate it until your blue in the face.
I'd have to say, probably the only way I would have tried to intervene would be if the guy was right beside me with his back turned. Even then I can't honestly say how I would respond, just like none of you mall ninjas can honestly say how you would have responded when the tear gas canister exploded and the gunfire erupted. So yeah, i would very likely hunker down and protect my family, and try my best to be ready if the gunman approaches me. I just pray I'm never in a scenario like this.
Another question... Let's say there were 12 armed citizens there, including all the mall ninjas. How many of you would be able to differentiate the armed citizen from the perp? Remember, the theater is dark, tear gas is affecting your respiratory system and vision, and your ears are ringing from the deafening gunfire. Oh, that's right, you're a mall ninja... You'd instantly recognize the good guys from the bad, and only shoot at the bad guy. Yeah, have a nice time in fantasy land. I'll be here when you decide to return to reality.