"I mean - I think it's mostly a matter of knowing what you're doing, not of, I don't know, some direct interaction between numerical levels? I imagine that you could teach me skills where you didn't get them by leveling at all, because you'd know enough to teach me, and that I could teach things to somebody from your world, even if they were learning without Skillups, but I'd have to know the thing. And I don't really know this thing. I've just been led through some exercises enough to get Lv. 1 of a Skill which means I have the Skill to keep doing those exercises. It doesn't mean I've done them often enough and know how they work instead of, of just being able to, do them - so I can't tell by looking at you if you're doing them right. You usually want at least a two-level difference before you try to teach somebody at all and a four-level difference is much better. I'm sorry if I said that at too much length, I'm still feeling a bit beaten(*) when it comes to saying things better and shorter."
(*) Lit. kneaded-like-dough.