Oh please. You can get .45 ACP in a perfectly concealable firearm. Taurus Millennium Pro for example. There are also slightly smaller versions in .40 S&W. Both perfectly good stoppers. No body working security, even on a volunteer basis, is going with anything less than 9mm. Maybe .357 in a light snubbie revolver, although reportedly she fired more than rounds than they hold.
Wasn't there a report that the attacker had on a bullet resistant vest? If so, she might have just knocked the wind out of him, maybe broken a rib or three. But stopped him she did.
I know, I have one! I was offering one possible explanation for why he wasnt instantly dead after being shot and like I said, I hadnt seen what caliber gun she had and hadnt heard anything about body armor until now.
Most folks dont realize that someone shot with a rifle is around 85% likely to die, whereas it is much lower around 25% or so with a handgun. I dont remember the exact percentage but I read it years ago and I was surprised at the huge difference.
The point is many firearms dont instantly do their work like in the movies, even if the person shot dies it wont always be instantly.
Either way, its a moot point, the thing is they are already trying to discredit this woman and what she did which was stop a domestic terrorist attack with her gun that they dont want her or us to own.