The point of this statistic is INTs with the lead or the game tied. Romo leads all QBs by almost double. Brady's throw was "desperate" because he needed to score. When you need to get a TD, it's always desperate. If you don't, you lose. When you don't need to, it's not desperate. If you have the lead, you don't need to make desperation throws with a high INT percentage that could give the other team the game. Romo has done that more than any other QB. Just because Brady wasn't under pressure, running for his life, side-armed, don't mean the throw wasn't desperate. He was on the 15 yard line and had one pass to get the ball in the end zone. The entire defense was protecting the end zone. That's a very low percentage throw but necessary to win the ballgame since you're losing. I don't see what's so hard to understand.