vericrat comments on Harry Potter and the Methods of Rationality discussion thread, part 19, chapter 88-89 - Less Wrong
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Oh snap. I didn't even notice that problem.
There is a third possibility: Dumbledore brought in the troll to guard the Stone (or other object), as in canon, and he was the one who cast the spells to protect it. I'm unsure about this, because it seems unusually violent for Dumbledore.
Why would Dumbledore enchant the troll against sunlight if it was going to be in the third-floor corridor all along?
To defend it against anyone with a sunlight-generating spell or who has some acorn potion handy.
In fact, isn't there such a spell used in Canon?
There's 'Lumos' but it's never mentioned as a dead-useful defense against trolls so presumably isn't as good as real sunlight or a sunlight-generating spell.
No, I could swear there was an actual ... maybe in one of the movies?
EDIT: I was thinking of this