Why are we still running the ball.
Well, it's hard to argue with a 3rd and 1 run in long FG range with 34 seconds in the half and a timeout remaining.
If you don't make it, you run the clock down to nothing, time out, try for 3. If you make it you spike and then go for 7.
If you pass, you either complete (probably not in the end zone) and the clock runs, you incomplete and Dallas gets 2 or 3 plays in, or worse you get sacked out of FG range.