I’ll offer her a .45-caliber expression of my sympathy that she can use on these mutants.
She doesn't need a .45 (at least not most of the time!). But what she does need is the simple power to permanently remove disruptive students from her classroom. Sadly, she'll never be given that power.
A not-so-short story: I once taught a science class of 30 kids, four of whom sometimes acted out (although not as bad as in the video). There was one ringleader in that group.
I was almost always in conflict with that kid. Nothing worked. It got so bad - and I received so little help from anyone - that I took to carrying a heavy iron ring stand with me in the hallways. Since I was a science teacher, that raised no eyebrows.
I fully expected to be jumped by him. And I fully expected to use that ring stand to give him a little surprise.
Anyway, a happy ending. The kid was arrested for selling drugs in the school, and was expelled. With no ringleader, everyone else settled down. It became a fun class to teach. (By the way, in city schools, "expelled" just means transferred to another building.)