As the title suggests, I am horribly stuck in what I call "upper cave" - the cave past the exit to the surface where bird that carries you normally dies to ghostly masks.

I made it there, but have no idea how to progress when I reach the new area - ghostly masks block all the passages, and one firefly doesn't seem to produce enough light to shine through the waterfall (the only way I seem to be able to go). There is a second firefly in a nearby room, but I can't lure it out as it dies to lightning bugs on a way.

So, I am kind of stuck, and to make it worse, I don't think I can even get out the way I came XD

Help would be much appreciated...