[@Hylozoist][@Blueflame]
Frisk shakes her head and smiles cheerfully. "Actually it's a river that runs into a lake. I think the rain water runoff made it and its the river bottom is so smooth and slippery," Frisk signs out and giggles, "Sans  right, though. Alphys, Gaster do you wanna join? You might has well since yiu got off early and all."