Paul Felder has seen a lot while working for the UFC, but he’s never seen anything like what happened this past weekend.

On Saturday, Felder was on the call for UFC Vegas 121, headlined by a five-round bantamweight fight between Raul Rosas Jr. and Raoni Barcelos that ended up being one of the scariest moments in UFC history.

In the fifth round, Barcelos appeared to suffer some sort of medical episode while Rosas was working on a takedown, going unconscious despite seemingly not suffering any major blow to cause it. Rosas stepped off from Barcelos, who was quickly attended to by the on-site medical team, but the Brazilian fighter remained uncons