Ambiguous

I tried to pay attention to the teacher. I saw him looking if I see, why do I still know when he tries to hide someting? Or doing something, that could leave me unsure? From the side of my eye, I saw him throwing a little paper ball in her hair. I reached out for her pullover, to let it fall. The girl looked in her hood. ,,don't worry, it fell" ,,What he is doing is rude right?", His bestfriend asks me. Why would he ask me that? As if he cares, as if he- Oh, I know why he asks. I just tried to ignore. Saying: ,,I don't care", is weird. ,,You're okay?", Why does he now asks such a question. I didn't answer. Ofcourse nothing was meant genuine.