If Garrett calls a timeout on the last drive instead of having Dak spike the ball, the game at least goes to OT (assuming Bailey still makes the kick). Cowboys wasted 15 seconds running up to spike the ball and waste a down, and they weren't even in field goal range at the time. The next play was the 7-yarder where Beasley got out of bounds. Could have been 2nd and 3 with almost a minute on the clock. Then you have 2 plays to pick up 3 yards for a first down, and you get another set of downs to get closer/throw for the endzone AND run the clock out. We spiked the ball to save the timeout (that didn't prove useful), screwed ourselves out of a down, and left 35 seconds on the clock (plus 2 GB timeouts) for the game-winning drive.

And I know there's an element of hindsight to critiquing clock management, but in the moment when we completed the pass to Witten I was yelling timeout at the TV, and I posted about my dislike of the decision directly after that drive.