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The Seahawks are a team on a mission: To erase the bad taste of last year's Super Bowl from their mouths. If the cold means both teams will struggle with the temptation to hit "quit shots" or the acceptance of defeat, the Vikings will be much more vulnerable.
If this is going to be the Football equivalent of the Battle of the Bulge, I fully expect it will be the Seahawks who dig in and say "Nuts" to surrender.