thescoundrel comments on Harry Potter and the Methods of Rationality discussion thread, part 11 - Less Wrong
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Just a piece, but one I haven't seen discussed- why has no one done a Priori Incantatem on Hermione's wand? We know harry knows about it, from clear back in chapter 13:
I don't know if this is part of Harry's plan, but it is certainly a line of investigation that has not been followed. There is always the possibility that whoever did the memory charm used Hermione's wand to cast the blood chilling hex, but once down that track Harry can start eliminating suspects for the memory charm.
Even if that test is performed and it is proven that Hermoine's wand was not used to cast the Blood-Cooling/Chilling Charm, Lucius et al. will simply claim that Hermoine stole another student's wand before the duel.
That seems like relevant information, though.
Yes, but we have now found a thread that we can pull on to start establishing a true map. The truth is entangled- so then we find the student whose wand was stolen, or we start testing the wands of our prime suspects. At the very least, we have introduced an inconsistency in the story- when would Hermione have had the chance to steal a wand? Draco called this dual- are we to now believe that Hermione showed up believing she would be defeated and stole a wand in advance, so she could kill Draco? I don't know if this is enough to forestall the vote, but it certainly is an avenue curiously absent from Harry's thoughts, especially when he is so focused on trying to prove Hermione's innocence- if his Super Dark Side can find this in his memory, I find it hard to believe it would not be of use.
And if her wand did it? Quite possible, but it wouldn't help.
I phrased that poorly- if her wand wasn't used, then it goes a long way to clearing her name. If it was, then Harry starts tracking down suspects, in order to find the wand that made the memory charm. Either way, its an investigation tool that still hasn't been used.
Wait, it actually says that? Oops- Priori Incantatem is the brother-wand effect from GoF, the investigative spell is Prior Incantato.