I recognize that. My thought is that his teachers and students around him had him pegged for a long time. The teachers had a legal duty to act as his parent while he was in one of their classes.
That one teacher that wouldn’t let students into his room should be run out of town on a rail.
Dare I say that that teacher should be charged with Reckless Conduct and Endangering the Life of a Child(or whatever the Florida code section says), one count for as many students that tried to get in.