“But it must have been a really powerful wizard, to drive all those dementors away. . . . If the Patronus was shining so brightly, didn’t it light him up? Couldn’t you see — ?” “Yeah, I saw him,” said Harry slowly. “But . . . maybe I imagined it. . . . I wasn’t thinking straight. . . . I passed out right afterward. . . .” “Who did you think it was?” “I think —” Harry swallowed, knowing how strange this was going to sound. “I think it was my dad.”