I live across the road from a Primary school.
Yesterday afternoon, for a sustained period I could hear a man really ranting, screaming and shouting from the classroom opposite. Their classroom door and my windows were open, but the class is across a wide road and some green space and I could hear it in inside my house.
I'm not a teacher, I briefly worked in school some years ago and the one occasion there was shouting like that, it stopped very quickly and adults from nearby classrooms went to find out what on earth was going on. It was that unusual and not "allowed". (On that occasion a teacher had responded to a child doing something dangerous)
Presumably, adults inside the school must have heard and will have taken appropriate action to support the adult and children and necessary....?