"Did you think people just get over torture? Since the war, St Mungo’s has discovered there’s an entire spectrum of brain damage that the cruciatus can cause, prior to reaching the point of insanity. Your aunt didn’t torture Hermione to insanity, but just—barely. We thought she was fine. The first couple months afterward—she seemed fine. She started having neurological issues a few months after the war. When she got them checked here at St Mungo’s, they found out the cruciatus had fried parts of her brain. That’s—apparently that’s how it works." 