One gun in the hands of someone willing to use would have done it. If nothing else it would have kept him busy until the authorities arrived.
Thankfully a secretary called 911 before she and the nurse went to hide in the closet where they were for 4 hours. Obviously they didn’t have their cellphones with them. All closets where people can hide should be stocked with cellphones.
good suggestion. if banks have the silent alarm buttons, so can schools.