asm
Белла не утверждала обратного, читаем внимательно.
“Crucio!”
Bellatrix screamed: the spell had knocked her off her feet, but she did not writhe and shriek with pain as Neville had - she was already back on her feet, breathless, no longer laughing...

You need to really want to cause pain - to enjoy it - righteous anger won’t hurt me for long...

Обратите внимание:
1)эффект был
2)"won't hurt me for long", не "won't hurt me"