"Helen!" Elizabeth's shrill, desperate cry cuts through the silence. A young woman with a round face and torn clothes hobbles out of the darkness to embrace her sister. As the pair embrace, their reunion is cut short by a fearsome screech. A massive crustacean the size of a house advances, pincers raised threateningly. The thing's slick, shining form is illuminated in green and blue by the cavern moss, and it emits a smell like rotten shellfish.
"Can you walk?" Helen asks her sister. Lizzie shakes her head. As the massive creature comes closer, you tell the pair to run. Helen looks torn for a moment, then nods in thanks before carrying her sister away.