Do classrooms not open from the inside? So that people can get to fire exits if needed?
This stinks.
I don’t know. They may have stopped them not wanting them to be mistaken for the shooter when the cops show up.
Maybe they were fire doors, not classroom doors, or even main entrances. The report didn’t say how exactly the frustrated vets were blocked, it may have been they were persuaded verbally [but I doubt that] or it may have been the way in was blocked; if I remember right the vets were in another part of the campus and the impression I got was them trying to get in, not out.
Maybe someone else can clarify.