Luck, and refs who are all swept up by the hype.
It's looking more and more like the year the Steelers won. If there's any shadow of a doubt on a call, the refs will side with the Pats all the way.
There were several "ticky-tack" calls in that game. Even Jaws commented on petty defensive calls.
The Ravens deserved the loss. You can't give the ball to Brady 4 times in a row in the 4th quarter. Those consecutive 3 and outs gave him too many chances.
But the crappy calls and the luck are clearly the only way that last drive was sustained.
Man I hate the Pats!!
Two things are infinite: the universe and human stupidity; and I'm not sure about the universe. - Albert Einstein
Silence in the face of evil is itself evil: God will not hold us guiltless. Not to speak is to speak. Not to act is to act. - Dietrich Bonhoeffer