If fans were asked to a compile a list of the most humble, respectful fighters in the UFC there’s a good chance heavyweight Shane Carwin would be in the top three if not at the head of the pack. Throughout his career Carwin has personified the concept of a gentle giant; a soft-spoken, hard-hitting Mixed Martial Artist who remained true to his roots, even going so far as to work a full-time engineering job while competing at the highest level possible.

However, in the case of Roy Nelson Carwin is ready to abandon his normal “nice guy” approach to things. Nelson has accused Carwin of using steroids in the past and needled him ever since with the feud ultimately landing the two rivals as Ultimate Fighter 16 coaches.

“You have to change your lifestyle,” began Carwin of the job of heading a TUF team in an interview with Bleacher Report. “But once you find out it’s against Roy Nelson, somebody that I dislike so much, I was on board. There was nobody I wanted to coach against more than that guy, and to kick his ass in not only coaching, but in the fight as well.”

“There’s that much animosity there,” he continued. “All of that stuff is real. The only thing I’ve ever had to hype for my fights is to just watch my style. My fights are exciting. There doesn’t need to be any hype or talk, but this real.”

Before moving on to a new topic, Carwin even took it one step further, saying, “I hate the guy. I dislike him. I hate him as a person.”

Carwin and Nelson are expected to fight at the conclusion of the season, debuting tonight on FX at 9:00 PM EST. Both are proven finishers, adding to the excitement of an eventual showdown, as all twelve of Carwin’s wins have involved a stoppage while the 17-7 Nelson has ten TKOs and five submissions to his credit.

Check out a preview for TUF 16 below: