premise: Darrell Horcher (born July 28, 1987) is an American mixed martial artist currently competing in the Lightweight division of the UFC. A professional mixed martial artist since 2010, he formerly competed for Bellator and the Cage Fury Fighting Championships, where he was the Lightweight Champion.
hypothesis: Darrell Horcher became a pro mixed martial artist when he was 30.
reason:  He became a mixed martial artist pro in 2010, having been born in 1987 he was not yet 30. The system was thrown off by the number 30 not having years old added on to it.