At the Beifong Metalbending Academy, the classes are being run by The Dark One, Penga, and Ho Tun. The class is interrupted by Sokka, who requests that the metalbenders follow him. The three waste time at first speculating the reasons for Sokka's arrival, however when he drops Toph's name, they do not waste any more time. As Aang reaches the factory and fires three large fire balls at it, Toph and her students raise an earthen wall to block the blasts. When he asks what they are doing there, Toph tells him they are there to stop his assault.