"It has a lot of common elements that we often find in harmful spells," Arianwen explained. "Malevolent curses are nothing new, after all. But this one seems to have a built-in degradation element to it ... on that seems to come in cycles, troughs and peaks that hit almost at random, but which we are guessing are intelligently targeted and controlled, probably by Mr Dolohov, himself. That's the only common trigger we can come up with. Annie can be fine one minute and then ... bang ... she gets like this."