“Polyjuice Potion, Harry,” said Dumbledore. “You see the simplicity of it, and the brilliance. For Moody never does drink except from his hip flask, he’s well known for it. The imposter needed, of course, to keep the real Moody close by, so that he could continue making the potion. You see his hair . . .” Dumbledore looked down on the Moody in the trunk. “The imposter has been cutting it off all year, see where it is uneven? But I think, in the excitement of tonight, our fake Moody might have forgotten to take it as frequently as he should have done . . . on the hour . . . every hour. . . . We
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