I like JJRye22's point. Especially in the scenario laid out in the original post.
With 16 seconds left in the quarter the chains are set in case some coach wants to run one more play before the quarter ends. If they do not, why simply reset the chains at the other end? Flip the chains just like you would under any other end of quarter situation and you have a check on what the R and U are doing with the ball.
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