Hero revisionism

Reading this story gives a good picture of how terrifying being involved in a US school shoot up must be for both students and teachers.

In brief - at least a couple of Florida students are saying that a teacher formerly called a hero in the media didn't seem very heroic to them when they were caught in the corridor and he (perhaps following procedure technically correctly?)  refused to let them back in the classroom.

I'm not sure who's right or wrong, to be honest, but you can imagine that causing some disruption in the school for some time afterwards.