"Oh.  Um.  I'm guessing that martial arts in your world don't do - things-that-your-world-doesn't-have - and that means you can learn a martial art just by imitating what you see martial artists do?"  Honestly that still sounds a little implausible to him, but whatever.  "The slimes made me do things exactly right until I got Lv. 1 of the Skill and I can definitely feel that there's, like, something going on, though it's very faint."

"Oh.  Um.  I'm guessing that martial arts in your world don't do - things-that-your-world-doesn't-have - and that means you can learn a martial art just by imitating what you see martial artists do?"  Honestly that still sounds a little implausible to him, but whatever.  "The slimes made me do things exactly right until I got Lv. 1 of the Skill and I can definitely feel that there's, uh, something going on, though it's very faint."