I have a chaotic idea, Welcome to hell: all of the trios have realized you are trouble, having come to that realization they put aside their differences to fight you, welcome to true hell you only have one shot ( some have the ability to hit the star/save file).
you could say frisk never existed in the first place. atleast when they fell underground because WE make the choices. but frisk having fun by doing genocides run is not true.