Previous play ended at 1:00 and resulted in a first down. Clock should have stopped the clock until the umpire spotted the ball and wound the clock. Clock operator failed to stop the clock. Once it hit 53 seconds, an official noticed the error, stopped the clock and had it reset to 1:00. Net result is ND probably gets that snap off with at most 3-4 seconds extra due to already being lined up once the corrected clock is started, but 3-4 seconds didn't matter, and even if they did it was the home clock operator's fault.