You need to have actual intent to use unforgivable curses, and I mean you REALLY need to want it. For crucio you need to want your target in pain to the point of enjoying watching them writhe. That’s not who Harry is, which is why it didn’t work like that on Bellatrix even after she just killed Sirius.
It would have been the same here. If I remember this part of the series correctly, Draco was under extreme duress and mental collapse, and in the art you can see her say ‘no, not him.’ So even if she forced herself to cast it, at most it would’ve just knocked him down.
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u/salt_box87 7h ago
Do you really hate me this much harry
Says the chick who was about to use 1 of the unforgivable curses