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One thing fans don't always realize is if your offense is bad, it makes your defense look bad.
When a team is constantly going three-and-out or can't put together a sustained drive, the defense stays on the field.
There are two problems with that.
One is that the defense gets tired and wears down. Eventually even a great defense will exhaust.
The other is that the more opportunities a team gets to score, the more likely it will happen. Seems obvious, doesn't it?
Remember that when judging the Carolina Panthers' defense, you have to take notice of just how horrible their offense was last season.
If the Colts' offense can't manage to put up some yardage, not even a line filled with Dwight Freeneys could get to the quarterback after being on the field all game.