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LONDON -- As we've learned over the past week, throwing insults at J.K. Rowling on Twitter is a very bad idea.

But attempting to use references from her own books to win an argument? That's an even worse plan.

SEE ALSO:This may be the most brutal J.K. Rowling comeback of all time

Following on from her repeated shut-downs of the people threatening to burn her books, someone else accused her of using "the mark of the beast in a children's novel".

It didn't end well for them.

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As always, Rowling's fans rallied behind her.

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To which Rowling responded:

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Rowling finished with this gem.

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So much magical, spell-binding sass.

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TopicsHarry PotterJK RowlingTwitter

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