The biggest rivalry in the UFC by far is Conor McGregor and Khabib Nurmagomedov. And we now have new footage involving their October 2018 fight. The pair competed in a grudge match for the lightweight title at UFC 229. Nurmagomedov came out on top with a fourth-round neck crank submission victory.

After the fight, chaos ensued with Nurmagomedov attacking McGregor's teammate Dillon Danis outside the cage while members of Nurmagomedov's crew attempted to strike the Irishman.

At the end of it all, McGregor took to social media to post the following:

While McGregor put on a brave face with that tweet, he was naturally disappointed, not only with the setback but losing to his biggest rival. We now get a glimpse of his real reaction backstage in a sneak peak of his upcoming McGregor Forever documentary that Netflix will release on May 17.

It shows Nurmagomedov dropping McGregor while a voice says, “You're going to face setbacks.” The former two-weight champion then sits down backstage with UFC president Dana White next to him and his family in the background.

A disappointed McGregor said, “I was beat and that's that,” before lying on his back and looking up at the ceiling.

Unfortunately, we never got to see the McGregor vs. Nurmagomedov rematch as the latter would go on to defeat Dustin Poirier and Justin Gaethje before retiring from the sport.

However, given that we'll be getting never-before-seen footage of Conor McGregor and his reactions to a number of recent setbacks, his documentary will certainly be worth the watch later this month.