Cowboys turnover turned into touchdown

How did Anthony Spencer not break up that pass or come up with the interception? Anyway, the Broncos are on the scoreboard with a 9-yard catch by Knowshon Moreno after Renaldo Hill forced a Tony Romo fumble on a corner blitz a play early. Romo never felt Hill off the edge as he looked to his right for a reciever on third-and-14. D.J. Williams picked up the fumble but Kyle Kosier saved the touchdown. On the TD, Kyle Orton had time to make a play but the Cowboys appeared to be in good position. Somehow the ball went between Spencer's hands. If he makes the interception, he's looking at a lot of green ahead of him. I'm not saying pick-six but at least the score wouldn't have been 10-7.