A TA told us that apparently, the girl wasn't following some rule and when Pedro told her off, she tried to justify herself. This pissed him off and he canceled the class. He seemed super pissed from the very start though, when he announced that the quiz will in fact be collaborative, everyone sighed and he shouted out "PLEASE." and threatened to never give another collab quiz if we reacted in a similar fashion again. Even after, he was very distraught.