Qiaochu_Yuan comments on Harry Potter and the Methods of Rationality discussion thread, part 19, chapter 88-89 - Less Wrong

12 Post author: Vaniver 30 June 2013 01:22AM

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Comment author: Qiaochu_Yuan 30 June 2013 05:34:21AM 2 points [-]

Because it's implied that Quirrell thinks Harry used it, it follows that Quirrell thinks it was feasible for Harry to use it. IIRC it's mentioned elsewhere that the killing curse is powered by killing intent and not magical power. Harry may not have wanted to use the killing curse either because he didn't have enough confidence in his killing intent (he has to want to kill something terminally, not instrumentally) or (and this is stretching) because he didn't want to deal with the political repercussions of being known for using the killing curse on top of everything else.

Comment author: ikrase 30 June 2013 06:52:38AM 9 points [-]

It's also possible that to Harry, 'tricky transfiguration weapon' is more mentally available than 'THE KILLING CURSE'. Also, for the same reason, Harry might not have learned it.

Comment author: Izeinwinter 30 June 2013 09:15:36PM 1 point [-]

Quirrel knows the killing curse better than Harry does. He also is likely to have information about Harry, which Harry lacks. So the fact that he is sure Harry could pull off the killing curse does not mean that Harry has any reason whatsoever to share his confidence. And having it fizzle would be fatal. "Finite the rock" on the other hand is going to work. So he went with that.