It was not the intent. The intent was to defend himself. But in so doing, Corliss Williamson lit the spark that ignited the Pistons to a 100-97 victory over the Knicks on Saturday.
  "There's really nothing to talk about," Williamson said. "It's just something that happens in the course of the game. We have to move on and push past it."
  The Pistons were down by nine points 26 seconds into the fourth quarter when Williamson and Shandon Anderson got tangled. Anderson pushed Williamson, and Williamson came back at Anderson with a fury.
  The two were separated quickly and ejected. No punches were thrown. But the game changed on that play.
  "That wasn't the intent," Williamson said. "But you enjoy when your team is able to take a bad situation and make something good out of it."
  Something good, indeed. Cliff Robinson came back into the game at that point and promptly converted a three-point play. Then Chucky Atkins nailed a three-pointer. Then Jon Barry made a steal and drew a breakaway foul, which means he shot one free throw and the Pistons kept the ball. Robinson scored again and the Pistons were rolling.