What happened to our defense after Auburn

converted that desperation 4th down in the middle of the 4th quarter on their own 20 yard line?? Did our defense just tire out? They were eating up major chunks of yardage and scored in 3 minutes, then very nearly got the onside kick even though we knew it was coming. Why can't Chavis see what's happening and call a timeout if he needs to and change out some of those overly tired players?? Was very similar to the bowl game against Clemson last year, where you could see and feel the other team just having their way with our defense.