re: Why do teams keep running prevent D near the end of the game?

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You don't need to stop them when you are up 31-8.

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well, what if it's 21-8? You remember the pittburgh's game? They stop pittsburgh all game. Then they played prevent which allowed the steelers to score 15 pts in 3 minutes.

My point is that prevent doesn't seal the deal. It leaves the door open for the other team to make a comeback.