I've put both the ruling and actual rules in my Foresee system games for duels, and one thing I have explicitly said clearly is that, since both parties to a duel consent to injury or death it does NOT cost a person all their Fortune / Fame ("Karma") to kill the other combatant.

This is because I consider Karma loss for violence to be based on the correct translation "thou shalt not murder" rather than "thou shalt not kill".