This explanation from the actress totally makes sense, seeing as characters in Dune have more than just physical fighting prowess - they have actual powers. While they don't seem to be purely magical powers, Rebecca Ferguson’s Lady Jessica is a part of a Sisterhood, whose members possess abilities beyond those of normal humans. The fact that she can weaponize her words makes her fighting technique much different than that of Ferguson’s Mission: Impossible character, Ilsa Faust, who fights solely through physical means and exists in a world where humans obviously don't have fantastical abilities.
