PROFESSOR LUPIN
You're sure about this, Harry? This is very advanced magic. Well beyond Ordinary Wizarding Level.
HARRY
If Black can fight the Dementors, I need to know how too.
PROFESSOR LUPIN
Very well. The spell I'm going to teach you is called the Patronus Charm. Ever hear of it?
PROFESSOR LUPIN
A Patronus is a kind of positive force. For the…

