You want people on the ground to fire back at him? You want them firing at a target they can't even see, hundreds of meters of away, with small arms...at a crowded hotel made completely of glass?
I CCW everywhere I go, and I am as pro-second as it gets, but this is a textbook example of a situation that should have been handled by law enforcement. Braining Lebron as he climbs through your window at night to steal your TV, or being the hero of Waffle House when drop Jose of the West-Bridge Cholo gang as he tries to hold the place up is great. Trying to take on an entrenched shooter in a crowded location in a confusing situation like that is only going to make things worse. If I were there, even with my gun on my hip, I would have been running for cover and shielding my gf.