"Oh, she was mad. She's always been totally random. Well, except when Bob cured her, then she was kinda sane, and she was really sane when she turned into a sprite, but then she became a virus again to fight Daemon and then she was crazy again."

He shrugs. "But someone had to distribute the cure before the countdown finished, and only a virus could do it fast enough, and there still wasn't a way to get it everywhere 'cept by fragmenting. If the infection didn't get cured everyone'd die anyway."