What Rockholds was thinking when he did that? Tried to close Costa eyes with blood? Should have used punches instead to create bruises or bloody face 
Not only that move looked stupid, but he could infect Costa with some crap. Thanks God Costa has "secret juice" (have you seen his move Fuck USADA during weight ins?) and alcohol (even though wine usually have low spirit percentage) to disinfect possible virus.
Infect him with what exactly? This is not underground street fighting. Not only that move looked stupid, but he could infect Costa with some crap. Thanks God Costa has "secret juice" (have you seen his move Fuck USADA during weight ins?) and alcohol (even though wine usually have low spirit percentage) to disinfect possible virus. All fighters are examined before fights and they can only fight if they are healthy, but besides that you are aware they got covered with blood all the time, abd cage is full of blood.
If you want sterile conditions you should not be fighting in MMA, but continue fighting in virtual video games
I think Rockhold finished his carrier in a style, and he did that to piss of Costa.