lmnop comments on Harry Potter and the Methods of Rationality discussion thread, part 3 - Less Wrong
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Comments cover up to Chapter 46. UN-ROT13'd SPOILERS.
Love the new chapters! Harry's takedown of the Dementor was epic! Yes, I know, that term has been devalued by inflation quite a bit, but in this case its original value and meaning hold. A very nice and emotionally powerful summation of Singularitarian values in Harry's buildup. Also, I didn't stop and try to guess what Harry's Patronus would be, but "the rational animal" is the perfect choice!
One little quibble though. When Dumb-ledore and Harry were trying to guess why Quirrell might want to bring a Dementor to Hogwarts, Dumbles never bothers to mention, "Well, Quirrell did challenge me to a bet, that if any of the First Year students could produce a corporeal Patronus, that I'd let him teach the Killing Curse to anyone who was interested." Naaawwwww, there couldn't possibly be some ulterior motive to Quirrell's desire to teach Dark Magic to the kiddies, could there? Surely not!
And isn't this supposed to be an "Unforgivable" curse, as in, "life in Azkaban" or "the Dementor's Kiss" for using it? Given the existence of such a law in Wizarding society, it doesn't make sense to me for Dumbledore to allow Quirrell to teach young children something that, if used in a moment of immaturity, could completely ruin their entire lives. "The WIzengamot has decided that having a temper tantrum is not an excuse. Send for the Dementor!" Imagine a boy like Canon!Draco given the Killing Curse to use as a First Year.
On the other hand, there are other spells that could be equally lethal, like Diffendo (a cutting spell) or Fiendfyre, and those aren't "Unforgivable." I suppose the thing about Avada Kedavra is that there's no defense against it. So, while other spells might be like teaching a young kid to shoot, the Killing Curse is like giving them a rocket launcher. One that's always loaded, has unlimited ammunition, and is carried with them wherever they go. I.e., not the same thing as a young kid having a gun that they take out and use under parental supervision.
I never really understood the claim that there's no defense against Avada Kedavra. Sure, there's no direct countercurse, but you can dodge it or levitate an object between yourself and the curse (Dumbledore levitated a statue in front of Harry to protect him from the curse in Book 5). Both of these responses can be trained to the point of instinct, and voila, you have a defense.
Wait, the fact that the second strategy works is inconsistent. If the Killing Curse can be blocked by inanimate objects, why is it that clothing doesn't block it?
I forget if this happens in the book, but in the movies the curse damages obects badly when it hits them. So clothing may just be too thin and weak to absorb it.
Maybe it's like a liquid, and can get through cloth but not an entire sofa or wall.
That makes sense!