Friday night's meeting between the Mason Punchers and the Shiner Comanches displayed the kind of football that fans should expect in a playoff game.    The first quarter had been toe-to-toe, each team exploring the other and trying to find any weaknesses that could be exploited. Neither would find any opportunity to score during the first period.    In the second quarter, as a cold north wind blew across the field, the Punchers began driving down the field.