That’s also a relative thing. His “stunts” are likely jumping around in a wire harness doing martial arts. He’s not doing Tom Cruise shit, like free-climbing skyscrapers or hanging out of airplanes. Nobody expects Boris Grishenko to be Jackie Chan.

Acrobatic fighting and swordplay choreography is hard to do well, which is why actors will often use stunt doubles. It’s not just “this is dangerous, bring in the person that nobody loves.” It’s more like “This guy playing the teleporting swordmonkey qualifies for Medicare, so let’s get someone who can rise from an Adirondack chair without grunting to do the blue demon crawly-bamfy-fencing bits.” If he’s able to do it, it’s going to look better in the movie.