Nigrescence |
Attack Non-Lethal USING the actual -4 penalty, but you could remove the armor from both combatants or provide only minimal armor (so no more than a chain shirt). The equipment itself would be agreed to or decided on by the duelists, so that's irrelevant, but I would actually impose the penalty for effect and I feel that the moderately increased whiffing would be more flavorful for a duel where the combatants are holding back for one reason or another.