back in contact with Yangchen via the ceremonial meal, but discovers that a vase crucial to the ceremony was destroyed in the earthquake. Remembering her words from before, Aang reconnects with Avatar Roku, reconciling with him in the process, and is able to talk to Yangchen, who explains the full terms of her deal with Old Iron; in exchange for the spirit leaving the humans alone, Yangchen would create a memorial for Tienhai, restore the land to its natural state and keep it free from human civilization, in order to prove that humans could preserve and protect. Yangchen set up the festival to ensure that her end of the bargain would be upheld even after her death. Yangchen states that with the deal now broken, Old Iron will return to wipe out humanity. Aang prepares to destroy the refinery and the surrounding town, believing that doing so will reinstate the deal and convince Old Iron to leave, but he is stopped by Toph and her students, who assume that Aang is again trying to hold on to the past at the expense of the future. The two of them fight, but they are interrupted by the arrival of Old Iron, prompting Toph to team up with Aang to fight him. Toph and her students use their metalbending to strip Old Iron of his armour, and Aang lands a fatal wound on the spirit in a desperate attempt to stop him from killing Toph. As he fades away, Old Iron laments on how there is no longer a place for spirits in the world, and that the Avatar will always side with humans against the spirits, being a human himself. Declaring that it is human nature to dominate, Old Iron nevertheless acknowledges his defeat at Aang's hands, before dissipating. Toph thanks and hugs Aang for saving her and her students, while Loban, who was nearly killed due to his greed during Old Iron's return, reconciles with Satoru. Lao convinces the rest of the refinery's workers to stay with him and rebuild. Aang is troubled by Old Iron's words, but Katara assures him that if he has a place in the world's future, the spirits must have one as well. While visiting the remains of Tienhai's memorial shortly afterwards, Aang is visited by the reincarnated Tienhai, who had enjoyed watching the humans of her time develop the old city, being impressed by