Albus Dumbledore Discusses Harry's Connection to Lord Voldemort

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After Ron leaves to take Gilderoy Lockhart to the hospital wing, Albus Dumbledore speaks privately with Harry about Tom Riddle's interest in him. Harry reveals that Riddle suggested they were alike, and Albus Dumbledore explains that Lord Voldemort accidentally transferred some of his powers to Harry when he gave him his scar. This is why Harry can speak Parseltongue.