The energy of a UFC main event is always palpable, as was the case with UFC on ESPN 41 in San Diego. Add a big knockout into the combustibility and the rush of cheers is deafening. When Marlon Vera knocked Dominick Cruz out with a nose-breaking head kick Aug. 13, the venue was shot into a frenzy. Supporters of Vera and Cruz had opposite levels of elation in the final result, but many across the board were sent home with a level of awe and appreciation.