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Ty Lee defeated Katara two times. In "Return to Omashu", she blocked Katara's chi when the latter was battling Mai in an attempt to prevent her from hurting Aang. Finally, in "The Guru", Katara did not recognize that Ty Lee, Mai, and Azula were impersonating the Kyoshi Warriors, and by the time she realized this, it was too late and Ty Lee had already started to attack her, once again blocking her chi.