Football Question

I know that many of you watch and know more about football than me, so I am going to ask you a question. If you watched the Patriots/Broncos game on Sunday, you noticed at the end, the Broncos had the ball on third down with very little time left. Orton gets sacked and it is a 4th and 15 at the 50 yard line, well out of range of a field goal.

The Broncos decide to punt and put the ball at the 5, and the Patriots do not return it, nor do they attempt a play with seven seconds left. The Broncos win the coin toss and drive down and kick a field goal to win the game in OT. Here is my question: why not try for the touchdown at the end of the game if you are the Broncos?

Hear me out for a second. They were at the 50 yard line, you take a a deep pass towards the end zone, what is likely to happen? The ball either gets batted down, or in a worst case scenario, the Patriots intercept the ball and run it back for a touchdown. What are the odds of that though?

Also, if you do not complete the pass and the Patriots recover with time on the clock, they will only have time for one more play and they too will be out of field goal range. To me it just seemed silly to punt at that point, especially when you are just letting a coin toss decide the game (I know they always say that some ridiculous % of teams that win the coin toss win the game...)

For those of you who watched the game, or know more about football, please weigh in on this for me.