~Snip~
If Mbappe had been able to score from the penalty spot, the match would have been tied. This penalty was very important for Real Madrid. After a goalless draw in the first half, Real Madrid fell behind 1-0 at the beginning of the second half. If Mbappe had been able to score this goal, Real Madrid might have been able to earn 1 point from the match.
If Mbappe had scored that penalty in yesterday's game, it might have been a different story today. It's possible that Real Madrid players would have put in more effort, as that goal could have brought them happiness and boosted their strength. They might have started aiming for a win. However, since Mbappe missed the penalty, I believe it partly affected the players' morale.
We know Real Madrid well they have the ability to equalize whenever they are losing to an opponent. They especially try to win games in the Champions League competition, as they have proven time and again. Yesterday's match might not have led to a win for them, but it's possible it could have ended in a draw if Mbappe had scored the penalty.