flag exchange got mixed up and spelt B-U-Y. And then as the crowd was singing the fight song after a TD to go up 14-0, TCU returned the kickoff 100 yards for their own TD and the song just kind of petered out.
But at the end of the day, regardless of the fumble/no fumble at the goal line in OT, BYU scored a TD on their possession. So the worst thing that should happen to BYU at that point is a 2nd overtime period. But BYU shanked the PAT. You can't make a PAT? You're leaving your team wide open to lose.