As soon as the final horn sounded Saturday night on the Knicks’ 123-112 win, Pistons forward and Long Island native Tobias Harris went over to his team’s bench and went down the line, offering words of encouragement to his group.  “It’s a series,” Harris reminded them. “You can’t get too high, you can’t get too low.”  For three quarters of Saturday’s game, the Pistons looked like the better team.