Even after the revelation of the Fire Nation's conquering of Omashu, Aang still insists, despite Sokka and Katara's reservations, on entering the city in search of Bumi; Aang feels he has a duty to find and rescue his friend. After entering through the sewers to remain unnoticed by the guards, they emerge into the street, and Sokka finds purple pentapi attached to his face; removing them leaves prominent red marks on his skin. As Aang removes the last one, Fire Nation soldiers approach them, accusing them of breaking curfew. Noticing the blotches, the guards inquire as to how Sokka received them, and Katara invents a cover story, telling them that they are a result of a highly contagious and deadly disease called pentapox. Believing the story, and not wanting to catch it themselves, they f