Guys are moved off the field after they have been evaluated and then it has been determined that it is safe to do so. Nick has a broken pelvis, he damn well couldn't move or move without significant assistance. He had also hit is head on the initial fall the refs and no one f'ed this up about as bad as could have been f'ed up. Incompetence on display and a total lack of concern for player safety.
The only way for the SEC and others to get better officials in every sport is to start openly evaluating them and then culling the poor performers, like the group last night and multiple others this year. The players and coaches get instant feedback and accountability, the officials have absolutely none. In the real world very few workers can screw up like a NCAA ref and have their boss come to their rescue time and time again. sooner or later it have to get fixed - likely if UK gets screwed in BB or Bama gets called for holding twice in a game.