They nod. Entirely their prerogative. Frisk hadn't bothered covering theirs until Grune made the scarf as a gift, and nowadays they wear it more for their own convenience. No, they don't want to explain how that happened to everyone who sees it--and on that note: "Please don't...tell anybody 'bout it. My thing," Frisk says, tugging their own scarf down. Thier scar's a long line too, not quite a mirror of Chara's.

Huh. Frisk starts by shaking their head, then pauses to actually think about it...

...it's not their phrase, and not aimed at that Frisk, but. "Not really. But don't kill an' don't be killed, if you can. It's real messy." Their lips quirk. See, it's kind of a joke. (Not completely.)