It was a bit of a cluster. LSU 3/G B12, incomplete pass with :05 remaining, A70 helmet comes off, and LSU has no timeouts remaining.
R announces 10 second runoff. Crew confers and they correctly restore :05 as the helmet off was not the only reason for game clock stoppage, so run off does not apply, but TCU has already headed for locker room. TCU then gets penalized for UNS, and LSU goes on to make FG to end the half.
Good learning play about not getting in a rush. I don't have the ability to post the video, so perhaps one of our video gurus will be able to oblige.