While Harold Diamond Is Most Known to Moviegoers as John Rambo’s “Stick-Fighting” Adversary in Rambo Iii, He Is Best Recognised in Actuality as One of Florida’s Most Well-Known Pioneers in the Sport of American Kickboxing. Born Harold Roth, He Was Given the Moniker “Nature Boy” Because of His Long Ponytail and Habit of Wearing Blue Denim into the Kick-Boxing Ring, Which Earned Him the Nickname. the Mid-1970S Were a Difficult Time for Him, and He.