Kamaru Usman and Ali Abdelaziz ran up on Colby Covington before the manager threw a punch during their casino buffet altercation ... new video obtained by TMZ Sports shows.
We broke the story ... Usman and Covington -- who HATE each other's guts -- faced off at the Palms Casino Resort only hours after Kamaru beat Tyron Woodley at UFC 235 ... winning the welterweight title.
In the original video published by TMZ Sports in March, it was unclear -- outside of their disdain for each other -- exactly what sparked the fight.