When your character is involved in a melee conflict then they need to rely on their individual prowess to survive. Anyone hoping to live through a Duel would need to rely on not just physically outclassing their opponent they would need to out think them as well. There is however more than one way to fight.
Each character will need to pick one active physical and one active mental Trait to use when they are dueling. Someone who is very quick will try to use their Speed when in a fight. Likewise, a person who is Cunning will use their wit to win a duel.