There would be blood. One man would be the victor, and with him the scales would tip.
Place the Man in Black in the same space as the Sheriff. The first player draws 3 fight cards for the Sheriff. The other player draws 3 fight cards for the Man in Black. The Man in Black fights the Sheriff, ignoring all text on played fight cards. If The Man in Black wins, Wanted players and the Man in Black gain 1LP. If the Sheriff wins, Marshall players gain 1LP and the Man in Black loses 1LP.