I disagree. It shouldn't be the job of teachers to break up fights.
Teachers should be educators. Not babysitters or referees.
The parents of the student should be sued.
None of my classes came with a bouncer. The teacher was the ultimate authority until the principal or a vice principal showed up. We didn’t have security back in the dark ages when I went to school.
I saw people wearing jackets; someone could’ve at least covered the student up.