According to the Sheriff, after the attack started, the armed school resource officer went to the entrance that the murderer used and cowered there for the duration of the murders.
They need to hire a combat vet and pay well for such a job. Problem with that is the left would not stand for it, considering their absolute hatred of anything military. They’d rather hire one of their own, over pay them, then blame the results on guns, the NRA, the Republicans and Trump.
Seriously, let’s assume they did hire a combat vet, a situation like this happened, and the vet just took the jerk out, very efficiently, before he shot anyone. The left would still get their panties in a wad. Probably take the side of the poor perp that got his $hit blown away.