I don't agree with the call, but its at least defensible. Manning had already turned the ball over twice, he gets worse the colder the weather gets, the team was making all kinds of mistakes, etc. Take the knee, let them regroup. Under old OT rules, Fox probably goes for it. But his team was all but guaranteed a possession in OT. And they ended up getting several, and did nothing with them. If Manning drives them down the field for a game-winning TD in OT, no one is talking about this today.