I think wahts hes trying to pint out is that a match should not be determined by a single roll of the dice. say we start at zero.. the target for the hero's winning is 5, the target for the Villains winning is -5. A successful attack by hero A will push the bar to 1.. meaning  the villain will need six successful attacks to now win. A successful block leaves the bar where it is at. this makes for a fluctuating battle.. might go on for a long time.. might end in a few moments.