Dumbledore Explains Kreacher's Role in Sirius's Death

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Dumbledore explains that Kreacher lied to Harry about Sirius's whereabouts, leading to Sirius's death. Kreacher, bound to the Black family, betrayed Sirius by providing information to Narcissa Malfoy and helping Lord Voldemort set the trap. Dumbledore emphasizes that Kreacher was only able to act because Sirius had mistreated him. Harry's anger flares again at the mention of Kreacher's betrayal.