green. I am a teacher! No need to shout at me. I a defending us against woman who thinks we all want to beat children!
I would like those situations not to arise, obviously. In case a, no as a 5ft 3 female, I would not physically touch students. Teachers who have done this in our school recently have been injured and I am not risking my own physical safety.
In case b, why would you have to touch a student who was throwing something? I don't get how that would help.
Case c , I'd probably let the silly sausage jump off the table. Can't say I have encountered case c.
Under no circumstances would I risk harm to myself.
I have intervened in fights before by placing myself in between students. Not something I like doing. Pretty sure that's what the police do. A teacher pushing kids aside might end up escalating things inadvertently as young people in an aggressive state of mind become more aggressive, I have found, when pushed back by either a teacher or nay kind of peacemaker.
So, obviously, as I said , in my ideal world, no teacher would lay hands on a (secondary) student. I can't see how it would usually help.