S3E16 · Book Three: Fire - Chapter Sixteen: The Southern Raiders

Complete story — includes the ending

Azula ambushes the group at the Western Air Temple, forcing them to split up once more: Hakoda and Chit Sang flee in the stolen Fire Nation airship with Teo, Haru and The Duke, while Suki, Zuko and Team Avatar blast their way past Azula and escape to safety. Though most of the group have seen enough to welcome Zuko into their team, Katara distrusts him and furiously reminds him that she was the first one to trust him back in Ba Sing Se, only to be betrayed. Zuko decides to help Katara find the group of soldiers responsible for her mother's death, The Southern Raiders, whom he identified after Sokka described their ships. Aang warns Katara not to give into revenge, but allows her to take Appa, believing she needs to confront her mother's killer for closure. On the journey to find them, Katara's behavior becomes increasingly aggressive, even resorting to bloodbending the current commander of The Southern Raiders. He tells them that the previous commander, Yon Rha, retired four years previous. When Katara and Zuko track down Yon Rha, he reveals that Katara's mother Kya named herself as the last remaining Southern waterbender to protect Katara. Despite Katara's desire for revenge, she is unable to bring herself to kill Yon Rha. Katara finally forgives Zuko and accepts his friendship. Zuko acknowledges to Aang that violence was not the answer to Katara's problem, but asks what he will do when he finally faces Ozai, leaving Aang visibly shaken.