Right as you attack his arm, he goes into a speedt off-balance attack at your legs. He dodges your sword, and you dodge his, but as you bring yourself about to dodge a second attack in his same off-balance swing, you are struck int he right leg. However, right as that happened, your sword managed to graze his sword arm!
YOU HAVE LOST A LEG. LARS HAS LOST HIS SWORD ARM. Bors calls a hold. You get to your knees to show your legs have been cut off. Lars tosses his shield over to his brother and switches his sword to his right hand. Bors calls "Lay on!" and the fight begins again. Finally you have equal arms, but you have the lower and slower perspective on things with your legs gone.
You can try to attack in this sad position, or you can defend. Attacking might fail due to his ability to just take a step back for defense. Although, defending will prove very hard as he can take advantage of your slow speed to take out your back or side before you can turn. It is dishonorable to do such a thing, but it is what you hear Bors telling Lars to do. If only you had a coach right on the field, too.