Sack fumble (which lead to the short TD) - run it/take a knee and go to halftime.
Kickoff return - kick it deep/out of the EZ and there is no return.
Not being a revisionist and talking hypotheticals - ND deserved to win. They outplayed/outcoached us. But we absolutely gave them the 14 pts that decided the game (and if we're not down 2 scores, we likely kick a FG towards the end).