Shaquille O'Neal was about to throw down another backboard-shaking dunk.

Ben Wallace wasn't having it.

The 6-foot-7 Wallace leaped and stuffed Shaq's slam -- forcing a jump ball, putting the 7-1 O'Neal on his back and sparking Detroit's defense that refused to let the Pistons' season end.

"It was a big play -- a momentum-changer," Wallace said of the third-quarter block.

"You know it was a foul," O'Neal said. "Don't ask dumb questions."

Whatever, the Pistons got back to their swarming ways when the Miami Heat had the ball, and Tayshaun Prince scored a career playoff-high 29 points to lift Detroit to a 91-78 win Wednesday night in Game 5 of the Eastern Conference finals.