Hmm, been mucking around with it for 4 or 5 hours now and haven't got the next room to load the textures yet. on the bright side i now know the entire bounding box for ruined courtyard and can pretty much aether jump back up anytime i please lol.
you should be able to jump up to the cliffs on top of the room and then jump down to the ledge next to the door; you want to be on the left side (facing the door). From that ledge morph and roll into the pile of snow like I mentioned and then from that ledge you can jump onto the door (hard though).






