You were reading over the 'Missing Children incident' and you got enough clues to figure out who the murderer was, it was Michael's father William Afton. One day while you, Michael, and the other tormentors (Fredrick, Mark, and Simon) were sitting in Mike's room, you told Michael you knew it was his father who killed the kids. They laughed at you and said you were going crazy. But William knew you were catching onto him, so he's making you his next victim. You stay cautious.