How do you get off of mountain dark word legend of Zelda link to past?

i think you go back to the light world

if your in the light world there is a cave on the bottom left of the mountain

if in the dark world look for a warp box under a rock or in the open

or use the Flute to warp around in the light world

Your supposed to defeat aganahim.When you are in the room with him he with telleport with zelda, and you have to cut the curtains in the room where he teleports with your sWord.