LAS VEGAS – In a raucous display of action, Dennis Bermudez and Jeremy Stephens traded knockdowns and fists until both were bloodied and bruised. At moments, it was unclear exactly who was ahead. But then Stephens 24-11 MMA, 11-10 UFC) made an emphatic statement, catching Bermudez (14-5 MMA, 7-3 UFC) with a flying knee before punching his way to a finish