Can a teacher tell a student to get down on the floor?

Well at the moment I am out of school but, this really ticks me off. This teacher was screaming at all of us. She started ignoring students, and yes we shout out. Our other teachers have said "Do not raise your hand, say out your thoughts" We were all confused on this math lesson( she created on her own), and we were all quiet until someone called out a question. She would then say "No you shouted out, I don't care what you have to say" Then they raised their hand. Teacher: "Yes?" student: "what does-" Teacher: Nope I don't care." This kept going until, wonderful little chad, said that is not doing your job, a child is supposed to ask questions, and a teacher is supposed to answer them" And she took him by the collar, and was screaming in his face "You have no right!" She even started pushing him, on the board, cornered. Then she screamed "GET ON THE GROUND, NOW!" And he sat their, all of us shocked at that thing. Untill, another student and teacher came in, her mood quickly changed.. and I think lied (couldn't exactly hear). Soo I am asking what is your intake on all of this. (public school, substitute).