Honestly, each and every educator shoul be given close quarters combat training.
The only they can be sucker punched like that is they never dealt with violence before. Should be qualified in a martial art before entering a classroom with people like this.
No training in the world can mitigate that punch. Unless there was a glitch in the video it was very fast and at almost arms length. If your chin can’t absorb that shot you’re done.
But. . .they will be sued and jailed for physically resisting/fighting back.
Zero tolerance for fighting. . .except when the punk initiates the physical attack. . .then its all about peace, love and understanding towards the unfortunate yoot and the teacher/helper must be fired.