Avatar The Last Airbender Book 3 Fire Episode 21 Sozin's Comet, Part 4: Avatar Aang Episode Title: Sozin's Comet, Part 4: Avatar Aang Episode Description: The Order of the White Lotus liberates Ba Sing Se, while Sokka, Suki and Toph disable the Fire Nation attack armada. Katara takes over fighting Azula, eventually immobilizing her in ice to chain her to a grate in the ground, then rushes to heal Zuko. They watch with pity as Azula suffers a full mental breakdown. Ozai accidentally causes Aang to enter the Avatar State by knocking him into a rock that pierces his lightning wound, unlocking his chakras. Aang easily overwhelms Ozai, yet still refuses to kill him, instead harnessing "energybending", learned from the lion turtle, to permanently strip Ozai of his firebending abilities and render him powerless...