Josh Gallagher, a junior from Coral Springs, Florida, posted a scathing message on social media accusing his math teacher, Jim Gard of Pompano Beach, of being a coward.
Gard defended himself, telling the South Florida Sun-Sentinel that he was simply following the rules and that he didn't see any students in the hall.
'I'm a victim of the Marjory Stoneman Douglas shooting,' Gallagher wrote in a Twitter post on Wednesday.
'Before the shooting took place I was located in the 700 building which is right next to the freshmen building facing it in my Math class with my Teacher Jim Gard,' he writes.