He relaxed a bit - but just a bit - his shoulder drooping to their normal state for a moment, a hint of a real grin edging into his smile. "Both, really..." Heh'ing, he rubbed the back of his neck, turning slightly toward where he figured the stairs were. "You haven't?! C'mon, Knives, you're still growing... You don't mind walking, right?" No answer for the 'have you' for a simple reason: he hadn't. Hadn't for... a few days. It wasn't anything he couldn't handle; a Plant could live on water just as surely as a rock could live in a stream, and for free of nausea, that was what he had done.
It worked. Knives was... this Knives was, even if he did see Tesla and hadn't told Vash, was still his older brother. Not the ---- man who'd locked him up for nine months with Legato. Just a brother who'd seen the worst and hadn't had Rem around to help him out.
Didn't mean he wouldn't be cautious, wary as ever, but it was hard keeping up that attitude with someone he'd spent his first year with. Again: forget the past, this was - the here and now. The Knives who lived at the Hotel in a dimension that didn't contain a Gunsmoke.