(Warning: Story contains coarse language)

Some members of the fight community believe referee Marc Goddard was responsible for the most decisive move in Dustin Poirier and Eddie Alvarez's rematch Saturday.

Alvarez threw a 90-degree elbow to Poirier's shoulder from the top-control position in the middle of the second round of the UFC Calgary headliner. Goddard stood the fighters up, issued Alvarez a warning, and took away his positional advantage.

Soon thereafter, Poirier stopped Alvarez with a flurry of strikes.

Some observers weren't happy with Goddard's decision, including welterweight Kamaru Usman, who criticized the referee on Twitter.

Fuck that referee. I will not fight if that ref is calling my fight. He cost Eddie that fight smfh #UFcCalgary — KAMARU USMAN (@USMAN84kg) July 29, 2018

Goddard was ready to defend his position.

Mr Usman, I understand that emotion is a factor. Mr Alvarez held the fence, clawed the ear & then threw the 12-6 elbow that is why the positional advantage was taken away. As for your request, no problem that’s easily arranged. I wish you all the best in your career. Thank you. https://t.co/x3GoCEkLqi — Marc Goddard (@marcgoddard_uk) July 29, 2018

Usman appeared to be satisfied with the ref's defense.