The UFC released a statement hours after the incident to confirm Barcelos was transported to a Level 1 trauma center for evaluation and was “stable, alert and responsive, with full movement†after a “CT scan and comprehensive assessment†were conducted.

“Raoni is doing well,†Ramos said in Portuguese on a video posted on social media. “He has all his senses, he's moving his leg, his arm, his hand, he's conscious, he's talking, everything is fine with him. He's undergoing some tests, and pretty soon he'll be here to talk to you guys.â€

“I just wanted to let you know so you can all stay calm,†he continued. “Keep praying for him. He's undergoing all the tests that are standard in a situation like this. He'll have to rest because of what happened, but God willing, everything will be fine. He'll be here with us soon and he'll be talking to you guys. Thank you to everyone who's been sending messages, positive energy, praying and keeping all of us in your prayers.â€

Barcelos was up in all three scorecards going into the final round, including a 10-8 in round four for one of the judges, meaning he was a little over three minutes away from a decision victory. The loss snapped what would be his sixth straight victory in the UFC.

“We had a great fight,†Ramos said. “We practice a sport that we can't predict, unfortunately, but we know for sure that we were doing our best. Raoni is a warrior, a phenomenal fighter, and he showed you that with all the technique he has, all the skill and heart he has. He showed everything about where he wants to go, where we all want to go, with all the work we've been putting in. Congratulations to him, and thank you all for the messages. Keep praying for him, and pretty soon he'll be back here with us to put on another great show.â€

On Saturday night, Barcelos took on Raul Rosas Jr. in the main event of UFC Vegas 121. It was Barcelos' first UFC main event, and it was going extremely well for him, with Barcelos up on all three judges' scorecards heading into the fifth round. But then, disaster struck.

In the fifth round, Rosas complete a takedown on Barcelos against the fence, and then after posturing up and landing a shot, Rosas stepped off the unmoving Barcelos, securing a KO win. Barcelos was immediately seen to by medical officials but remained on the ground for a long time, with the production team not even showing him. Even after multiple replays, it's still unclear exactly what happened to Barcelos, who was stretchered out of the APEX and the MMA community has him in their thoughts, reacting to the terrifying scene.

Raul Rosas Jr. and Raoni Barcelos competed in their first UFC headliners on Saturday at the Meta APEX. After four wild rounds, the fifth round is when the fight stopped after Rosas landed a takedown, and Barcelos went unconscious and limp.

Check out the way the fight ended below.

The fight was action packed through the first two rounds with Rosas coming out guns blazing early, throwing everything but the kitchen sink at his veteran opponent. Barcelos began to close the cap, and used that momentum in the second round — landing nearly 60 significant strikes in the round as Rosas visibly began to slow down.

Round 3 was back and forth with Barcelos getting a nasty foot sweep takedown and dominant back position. Rosas was able to sweep, get top control, and land some good ground and pound. But Barcelos got back up and continued to pile up damage and fatigue numbers on the Rosas side.

In the fourth, it was all Barcelos, delivering a pillar-to-post beating on the feet and on the ground to Rosas, nearly finishing the fight on multiple occasions. But in the fifth, Rosas went for it knowing he needed a finish, then landed the takedown that ended the fight.

With multiple replays, it was hard to see what actually knocked Barcelos out, but he was stretchered out of the APEX.

After the win, Rosas put over Barcelos for his toughness, called for a bonus, and asked for the top-seven opponent.