Grave Peril
Why do the vampires poison the wine at the masquerade ball?
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Cat
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Cat
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The wine at the ball is poisoned with vampire venom because if Bianca poisoned only Harry's food or drink, it would be a violation of the rules of hospitality, and start a war with the White Council. However, if the entire wine supply is drugged, then that is proof that she was not targeting Harry specifically.