I'm guessing this is a street fight right? Yeah Rocky's walking through Chuck Norris with little trouble. A lot of Karate guys never had good boxing which weakened them for a long time. Kyokushin Karate with face punches and Goju-ryu (Practically MMA) Are the best forms of Karate to go against other stand up styles and Chuck Norris don't have them. Norris did train in Judo/BJJ but he wasn't competitive with them, they were just hobbies. Rocky was a hard punching street fighter type that happily fight dirty to which a traditional Martial Artist wouldn't be able to a handle. Now a guy like Lou Thesz or Gene Lebell on the other hand would be a lot different as they were both good grapplers with submissions, Gene also trained in boxing so he could read a boxers movements better than a guy like Chuck Norris, also was a very mean guy himself.