When death is cracking past your head your decisions have to be fast and correct. If the armed deputy was safe under cover, but NOT under fire, then you would think he would move to a more strategic position to do his job. He was armed, the students being shot were not.
If that school was a gun free zone, is it possible the security guard did NOT carry a gun. I have seen that before, that their security is gun free, in those zones. It makes zero sense to me, but when do Dems/left make sense?