"You are clearly unfocused and your presentation is a mess! You cannot expect your students to learn anything from this sloppy performance! If you're feeling unwell, you should have had a substitute come to take your place while you recover!"

You're not promoting a good learning environment, Rhys. Shame on you. Way to waste everyone's time... But Kiyotaka has juuust enough tact not to say that out loud. Not to a teacher, at least.