40 Creepy Facts About The Black / Lestrange Family From Harry Potter
Bellatrix Inadvertently Teaches Harry how to use Unforgivable Curses
After Bellatrix kills Sirius, Harry is understandably a little upset. He decides to take out his anger with Bellatrix using an unforgivable curse. Specifically, he uses the cruciatus curse in an attempt to make her feel unbelievable pain. The curse knocks her back, but it doesn’t have the intended effect. She tells him that he has to really mean it for it to be effective.
In doing so, she inadvertently teaches Harry how to use them. Of course, because Harry is generally a good person, he probably doesn’t have cause to very often. Even in his final battle with Voldemort, he casts a disarming spell. He never wants to maim people, even though he might know how to.