They just ran into a buzzsaw. Buffalo-KC should be a good one.
As for the Dallas game, I heard McCarthy's reasoning that a Hail Mary from the 25 is easier than a Hail Mary from mid-field, but with only 14 seconds, he had to know that a run up the middle would take the whole clock. With 14 seconds, they could have taken 3 shots from mid-field (assuming no interceptions). In any case, Dallas shot themselves in the foot the whole game with stupid penalties.