Based on the clues in this chapter, doesn't that mean Soma's power is that his common sense is reality? My previous life's abilities are naturally earned, so it's not a "skill". I see you before me so therefore I can cut you.
I read your recent translation for Bishoujo ni Natta kedo, if you need help with weird idioms and such, hmu. I won't be able to get everything, but these years of immersion and variety TV shows should add more lingo.