Key Play

does anybody know what happened on that 3 and 1 with about 5-7 minutes to play-my eyes are getting a little blurry but it looked to me that Keylon Kincade burst past the defensive line and picked up what looked like about 2 1/2 yards-then the referee pushes it back they measure and SMU was short. I guess he put his knee down earlier but I never saw it. Wasn't that when we decided go for it on 4th but the :25 second clock expired before Bartel got his TO.