In article ,
says...

Quite frankly, this is what I am talking about. Resistance of any kind
usually stops mass killings, in their tracks. Notice this guard never
had to fire her weapon.. I understand she is very brave, but based on
everything we know about these cowards, most could be held at bay, from
good cover too... I don't give a **** what loogie or harry say, this
proves I was right, period...

https://www.youtube.com/watch?v=DEDEi8ZZ--E

This guard stopped this man for 10 minutes until swat came and shot him...

Nuff, said...

Idiot! Do tell, what would she have stopped if she were on the other
side of a large school?