Frisk is pretty light, but running in quicksand is still too tall an order. They manage to keep from sinking into it immediately; they lift their feet up like it's hot, trying not to stand in one place for too long. The strangeness of it ruins their momentum, and they only get a few feet away before Lapis's scream stops them in their tracks.

They turn, cringing at the ugly blisters visible on Lapis's skin even from here. Is she going to die? They don't know how Gem souls work. But they're different from humans or monsters: Lapis doesn't eat or drink or sleep. Didn't she say she was made of light? How is she burnt?

That moment of hesitation has them nearly knee-deep in the muddy earth. Attempting to brace themself with a hand on the grass doesn't help, so they just try jumping straight out. Ugh, gross.

"Lapis?" What, like they weren't going to try and help SAVE from here? "You came here for Steven, remember?"