You ran away from Snowdin, entering the Hot-Lands and quickly hid behind a giant rock, trying to get away from Frisk (Possessed by Chara.) They walk past the rock as you peek, they see you and try to slash you but miss, you fall to the ground and Frisk is standing over you with her knife until all of a sudden all of time RESET's and you see a ghost female version of San.

A-Sans: Sighs "What do you want?"