I just retired from education. The standard practice for a shooter in the building was to hide out of view from the locked door's small window and close all the window shades. We would go to a safe corner of the room. If you were in the halls, you would get students into bathrooms and classrooms immediately and if in the cafeteria all students into the kitchen area. If there was a potential threat outside the building or the surrounding community, all window shades closed, all doors locked, and none can leave or enter the building. No hiding under desks!
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