Trying to explain things to Longbottom means I have to understand them really, really well because he's so dense I have to explain them five different ways. You don't need me to explain Transfiguration to you. And neither do Teddy, Blaise, or Harry. And Vince and Greg don't care enough to listen.

But it would be fun to revise with you lot even if you don't need me explaining anything to you. Especially if you'll help me with Potions, Draco. You and Teddy may fight for the top scores but you're much better at explaining things than Teddy is.