kim lost to demian maia via tko on july 7, 2012, at ufc 148. the bout was stopped in forty-seven seconds in the first round by referee mario yamasaki, after maia took kim down and ended up in the mounted position. many observers, including the ufc commentator joe rogan, thought that kim had broken a rib during the bout, but it was later revealed that he suffered a major muscle spasm while defending maia's takedown attempts.