When you are duelling, it means that you are fighting in one against a one. You must do everything possible to beat your opponent with the force of our feet, our fists or our weapons.
In a duel, you must both defend and attack because you can not make diversion to destabilize our opponent. You can make combos to cause your opponent more damage and sometimes even make special moves that are more powerful than normal strikes.
Each opponent has a gauge that indicates his life over him. As soon as he takes a hit, his life decreases. When it reaches zero, the game is over.