I think it goes without saying here he shouldn’t have had an assault weapon.
I don’t know if there were people there with their own weapons. If there were, it may not have been feasible to try to take this guy out while he was spraying bullets everywhere. I read stories every day, though, where ordinary citizens do courageous and selfless things to help themselves and others. So who knows? I suppose we’ll be hearing stories eventually of what went on in the moment. It would be reckless to try to take a shot at a gunman if there wasn’t a clear target, no? With the chaos of people running everywhere and an assault weapon being fired, it’s not like one could take their time and perfect their stance without becoming an easy target themselves. There’d have to be a judgement about chancing it in the moment - if there was even an opportunity. (Maybe some of those carrying were hit?) My thought was just that, seeing your post about carry laws in ME, things might’ve been different if someone carrying could’ve stopped the carnage. I’m pretty sure that’s the idea behind carrying. YMMV