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Continuity mistake: When Severus talks to Narcissa and Bellatrix in his house, he states that he "had sixteen years of information" about Dumbledore when Voldemort returned. However, Voldemort returned in June 1995. Snape would only have been teaching at Hogwarts (and supposedly spying on Dumbledore) for not quite fourteen years at that point, as he started in 1981.

More mistakes in Harry Potter and the Half-Blood Prince

Answer: Aside from the fact that Hermione is obviously a terrible liar and her dialogue is suspiciously inquisitive for someone who often buys and sells dark artifacts, wizards can use Legilimency to determine if someone is lying.

Greg Dwyer

Legilimency is a rare talent among wizards- only Snape and Voldemort are known to have practiced it openly in the books. It is more likely that Hermoine has no idea how to act like a bad person, let alone a Death Eater.

Bellatrix was using it. She apparently taught Occlumency to Draco - Snape guesses this during a conversation with Draco.

More questions & answers from Harry Potter and the Half-Blood Prince

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