Well the problem is that it really doesn't reveal that your opponent has a higher score due to the fact that there is the random quality added to it all, so that a lower skilled fighter can kill a better one with luck.I disagree entirely. Now, if you really think that a swordmaster would not look for challenges then you must disagree with your own suspicions as well. Because we have multiple mafia factions, and to be revealed as good with the blade would make a mafioso an assassination target as well.
It's simple really: if you have good reason to suspect someone, it's a pro town move to challenge them. If you win, you remove a suspect (same as lynching) or kill a mafioso. If you lose you lose, maybe revealing your opponent to have a high score. With the mafia knocking off 3 or 4 of their own choosing every night the town needs greater killing power as well.
Of course...my ibn challenge was because of his namby pamby "watch out or I might challenge you!" post for which he clearly deserved to die
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