Is this normal behavior for a ref?

I saw this watching the Bama v Aggie game and was waiting to see the reply online. The ball has already been set, play clock down to 17 sec. but Bama has too many men on the field. The Ref runs in to stop Hurts from snapping the ball, seems to tell him something and they wave off #25. But another ref throws a flag and catches it. The same ref that ran in to stop the snap puts his head down as if he is upset. Do refs normally run in to stop a snap?

Video here