Harry Potter and the Deathly Hallows discussion thread (SPOILERS)

[Bill Murphy]

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Nope. It's already been said, it's a fairly large plothole that house elfs can do all sorts of magic, and yet they're not being used by wizards

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The series is full of these types of holes. Time Turner anyone?

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We could go back & forth on the elfs all day, but JKR realized the Time Turners were a problem and emphasized that they were all smashed in OOTP.