Smoot Lays the Smack Down (Redskins at Cowboys)

[SirClintonPortis]

This "you let your D do what it's doing" principle is superseded by the "don't let your opponent know what you are doing" principle. Considering that he called the SAME play twice in a row already, you DO NOT do it a third time. If the opponent knows what you play is, they'll find a way to beat. Not only that, BEATING A cover-0 means BIG PLAY almost every time.

Also, playing prevent USUALLY results in a dumpoff to the back. He could have called an overload blitz to one side, a zone blitz. An all-out cover-0 blitz was NOT necessary.