Tsubasa RESERVoir CHRoNiCLE S01 E05 The Battle of Wizards

Masayoshi and Mokona have been kidnapped by Primera as she leaves a challenge for Syaoran, Fai, and Kurogane. Though they run into some communication trouble since Mokona acts as a translator for them, they make it to Hanshin castle. Fai decides to fight in Syaoran's place as he reveals his Kudan which allows him to fight and a battle between Fai and Primera ensues.