After rescuing Sokka from the storm in the previous episode, "The Blue Spirit" begins with Katara and Sokka both falling ill. Sokka, who started with nothing more than a cough, is now falling into horrible delusions and is barely lucid. Katara attempts to care for him, only to begin coughing herself, prompting Aang to fear for both his friends' lives. In response, Zuko throws a fire ball at him. Quickly disappearing, Aang finally returns to Katara and Sokka with the medicine. Despite this and his escape, he seems melancholy.