"Normally, rune connections are one-way links," Albus explains matter-of-factly. "You place them, they affect the object and you're out. But with the puppets, there's a permanent connection between you and the object, until you cut it. So we didn't have to disfigure our whole bodies, we invented the control book. If we touch one of these control runes, the puppet executes the corresponding command. A three-way link."