[Though he notices the smile, Slaine doesn't realize it's in response to accidental humor. It's nothing that he lingers on, instead listening to what Genos had to say. What might it be like, to have a body like that? He can only imagine, and he doubts that much is accurate to the reality of it.

Weapons as an afterthought though... That he considers for a little longer before he says anything, shelving it only when Genos seems to hesitate]

Does it cause you discomfort, replacing your arm?

[If it does, he'll have to keep it in mind. Hopefully Genos doesn't run into any further problems like that in the future, but he does know machinery requires maintenance]

Perhaps the priority was your ability to use them for day-to-day activities more than combat.