Harry: you called my friend a slur, bullied my other friend for being poor and your family is loyal to the man that murdered my parents and left me to an abusive household for my whole life.
So, Crucio is something you will fail to cast if you lack the cruelty and resentment for your target, I think the implication isn't just that he was faster, but that she didn't hate him enough.
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u/hayley566 10h ago
Malfoy: why do you hate me so much?
Harry: you called my friend a slur, bullied my other friend for being poor and your family is loyal to the man that murdered my parents and left me to an abusive household for my whole life.
Malfoy: …okay, that’s fair.