At the Evolution Combat Sports event in Clovis New Mexico event according to the Na Koa MMA Podcast:
The brawl was apparently about a young lady now dating the UFC 155 lb fighter Donald Cerrone who used to date main event fighter of the evening Marcus Sursa. Comments were exchanged after Sursa returned from a trip to the rest room and Cerrone was over seeing the warm-ups of several Jackson MMA fighters on the card this night, some words were exchanged by the two and then a shove followed by Cerrone throwing a punch causing a laceration on the eye of Sursa, he responded with a punch cutting the lip of Cerrone. All told, Sursa was now out of the main event tonight against Buddy Roberts of Reno, NV due to the cut he suffered.