If he realized Luka was having any dilemma at all, he'd back off. This was mostly just an excuse to touch him (a lot) more, but uh I mean he also thinks it makes sense to not want to handle knives on your own when you can't see them. It doesn't even occur to him that the princess might be just fine figuring this out without him hovering. He is a dumbass sometimes.

As it is, he watches Luka's cut, slipping his hands back and out of the way so he can see.

"That's good. Here, ah," he pauses a beat, glancing down at Ten as he sets a bowl on the counter for them. He looks first at him and then uh down at his hands? The kind of cutting he normally does isn't so precise usually, so he's taking a second to remember the way the monster had moved in the moment. Right.

"If you lay the flat of the blade against," and he brings Luka's hands together exactly as he says it, moving him into a couple quick cuts as he describes the motions, "the flat of your knuckles here. Keep your fingers tucked in. And always move this hand first before the knife, then the blade never overlaps with your skin. You can't cut yourself." He finishes this by slipping his hands back to Luka's wrists, touching them gently so he can try it now.

And also uh glancing down at Ten again. He doesn't say anything, but his eyes definitely scream, Right?? Please don't tell him he gave this lovely man bad advice.