... Penn and Teller, there have been some incredible magic acts over the years. Whether it’s illusions or supernatural feats, each magician has something that sets him apart from the rest.

Perhaps there has never been a better disappearing act than the one the Pittsburgh Steelers defense has been pulling in the fourth quarter this season.

Smothering, aggressive defense in the first half is giving way to tentative, cautious defense in the fourth quarter and it’s costing the defending champs on a number of levels.

So what is responsible for the late game defensive stall the Steelers have been experiencing?

The Steelers 3-4 zone blitzing scheme is very...

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