You can challenge another player to a duel, and if they accept, the battle will start. HHP damage and battery clue dropping is disabled for the duel, and the duel is over when one (or both?) person(s) are knocked out. The winner is given a token amount of LP (barely enough to justify SHP damage). I could see this mostly being one civilized manner of settling a dispute, or even honing your own combat skills without the danger of HHP damage or someone snagging some battery clues.
Of course, this would open the road for "To the death" duels later on, if people want such a thing.
