Watch Charles Oliveira's intense live reaction to teammate's brutal KO at UFC Vegas 121

The former UFC champion was watching as one of his lightweight teammates entered the Octagon at UFC Vegas 121 inside the Meta Apex.

Before the scary scene in Raul Rosas Jr. vs Raoni Barcelos , which headlined the event, Elves Brener delivered one of the best performances on the undercard.

The Sao Paulo native flattened Josiah Harrell in one round, and the winner may have heard his training partner celebrating all the way from England.