Oryx suggested that the Longbottoms had not been tortured into insanity by the Death Eaters, but tortured, Obliviated, and released, in case Frank might subsequently learn more. And that Frank and Alice’s minds had been ripped apart by the Ministry (or just by Crouch), trying to recover the Obliviated memories. Because the Ministry guessed that the Longbottoms had been interfered with by some free Death Eaters, and were willing to sacrifice their minds in order to recover their memories.
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( I’d )
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( I’d )