Book 2 Chapter 8 "THE CHASE"

Aang and his friends are relentlessly chased by a mysterious machine, which makes it impossible for the group to stop and sleep. The lack of sleep makes everyone irritable, and fuels a quarrel between Katara and Toph. Toph realizes they are being tracked by means of Appa's shed fur. Aang lashes out at Toph for criticizing Appa, causing Toph to leave the group. Aang takes some of Appa's fur to act as a decoy to lure their pursuers away from Katara and Sokka, but he is found by Azula in an abandoned village. Toph meanwhile runs into Iroh, who reminds her that it is not a sign of weakness to accept help from others the way she believes. He also reveals that he is tracking his nephew, trying to let him discover his own path. Aang battles Azula and later Zuko, but is joined by his friends just in time, as well as by Iroh. Azula feigns surrender when she is cornered six-on-one, but wounds Iroh and utilizes the ensuing chaos to escape. Katara and the group offer to help Zuko, but he furiously rebuffs them and lashes out at them to leave. The group can finally get some much-needed sleep as Zuko tends to his severely-wounded uncle.