Norris didn’t need a stuntman.
But, according to Norris and choreographers on the set, Carradine could have used one.
Norris once said that Carradine was repeatedly unable to hit his marks and was delivering sloppy kicks that would have connected. IIRC, his remarks showed that Norris had little regard for Carradine’s ability or professionalism.
Reminds me of the thing between Bruce Lee and Burt Ward. Ward had pretended he knew karate to get the part of Robin. Lee challenged him to spar. Ward, very wisely, declined. Lee could have whipped Adam West, Burt Ward and the guy playing the Green Hornet without breaking a sweat.