            "For others—Purebloods and the like—the Book functions differently. At the instant of a wizarding child’s birth, the Book is inscribed with that child’s name, whether or not he performs magic at a tender age. Henceforth, however, the Book works the same. An alarm would sound. After Mr. Black’s return, his name was re-inscribed onto his family’s page. It seems as though his years of magic on this Earth have been reset, and the alarms now view any magic performed as underage. His exact location isn’t being revealed by the Book, though I believe that is due to the unstable nature of his magic."