This is the real thing - IMO, there`re no fighters in any style that can menage withe these guys. This is the mixture of everything - from judo, wrestling, karate, box, jiu-jitce... No (just) boxer can win them - they`ll just grab him, pull down, twist his leg, head, or arm - Minotaur is especially good in that (Brasilian jiu-jitce)...and you can beat him in the head by fist...nothing.
Maybe there`re something on the net (fight movies, etc.), try the "Ultimate fight", "Pride", and the names of figters in the "Google", this is a big thing in Japan...
Like my friend said, and I repeat "there`re nothing more manly and macho, like two man fighting each other, dressed only in their panties."