You Don't Show Any Emotions, You Dont Show Anything Else

The teacher probably was like, oh my God, your sister's dead. How am I not going to give you an A for the whole course? No wonder you've been weirdly deprived of emotion. You're holding back so much because your sister died. So maybe the tactic wasn't that they actually showed more emotion. Maybe it was the content of the speech that got that grade up. Either way, win, win.