Yahoo Sports. Former UFC Champion Merab Dvalishvili was recently ambushed and assaulted by a group led by fellow MMA star Usman Nurmagomedov in Abu Dhabi, UAE. MMA is a violent and dangerous sport, and often,. Usman Nurmagomedov ambushed and bloodied Merab Dvalishvili in Abu Dhabi, sparking a hotel lobby brawl involving multiple attackers.