            "Yes, well, Miss Granger, on that day in 1983, a new line in the Muggle-born pages sprung forth documenting your magical signature. A blank plaque, if you will. A Ministry official—or often a Hogwarts professor—investigates the incident and records your name for the Book inside that plaque. If you were to perform underage magic again outside of Hogwarts, that page would set off alarms for those in the Ministry tasked for watching it. And of course, your exact location would appear in the Book."