S1·E8 The Challenge

Breeze is wounded during a battle with the Warlords. Determined to let none of the other Knights of Justice come to harm at his side, Arthur challenges Viper to single combat, and has Zeke deliver it with other Warlords as witnesses so he'll have to keep his word. But everyone else's misgivings about Arthur's plan prove well-founded when Viper employs treachery in the duel.