[stuartcr]

I would prefer not to be anywhere near either of them.

The good guy isn’t a threat, but he would probably draw fire and I would prefer to be as far away from that as possible. Of course this is all guessing, as I wasn’t there, don’t know where I would have been sitting or where a potential good guy with a weapon would be. He wouldn’t necessarily get to me eventually, as he didn’t get to everyone during the real thing either.

[BitWielder1]

I would prefer not to be anywhere near either of them.

I would prefer not to be there at all.
Wait, I wasn't.
We can armchair speculate all we want what the best "strategy" would be in an unexpected situation.
I firmly believe that if I ever was in that situation, I'd be safer, on average, with one or more good people shooting back at the gunman.
If you don't share that belief, if you think that one or more defenders would actually increase the dangers to you, I can only say I disagree.
There are if course no guarantees. We could be killed, or not, in either of hundreds of possible scenarios.

Maybe we should run this through the simulator in a "Deadliest Warrior" episode - Crazed Gunman versus CCW Holder.