A sound of movement and scrabbling crops up, from below, and Lucas jumps in some surprise, flinching away from the invisible wall just in time. A kid pops over the edge of the walkway, very promptly--a kid wearing a shirt with stripes, and even before they speak up Lucas is almost certain who they must be.

But the words confirm it, and his own demeanor brightens even more. Lucas smiles, staring back in turn--though he's a bit less in wonder, and a lot more plainly relieved to see them at all.

"Oh--you are? You are..." The relief is in his voice too, and he trails forward again. "Gee, I'm--I'm really glad that I found you! I've been looking, for a little while now. I thought--I thought maybe I'd broken something, since..."

The fellow kid's words properly sink in now, belatedly, and his smile fades marginally. "...Yeah, they didn't--they didn't know why I was here at all. Do they not know the arcade's been closed for awhile already...?" His voice trails off, bemused and more than a little concerned, but other thoughts catch up to him. Lucas steps up to the edge, offering a hand to Frisk--albeit a bit uncertainly, suddenly unsure of the invisible wall's status now. "Um, but also, do you...need help getting up? From there...?"