Above and Below the Waterfall Help

I've been really loving this level until I reached this point



Now I have no idea what to do.  There are fives exits: one leads back to where I was, two are blocked by keys I don't have and the other two lead to seemingly impassable spike lined walls. Any help would be appreciated.

P.S.  I'm playing on the Hard difficulty if it makes any difference.

You've found a bug in the level. In the screen below this there is the Yellow key, which can be taken right after Umbrella. So, since you haven't taken it, now you can only cheat to get it.
[mod]Added spoiler tags for the cheat[/mod]

Are you 100% sure that's a bug? I can't check the level right now, but I don't remember there being a bug like that; that level is really intricate.

Not 100%, but close to that. I don't see any way to come back there.

My bad. I seemed to remember there was a Shift to get there, or that the bug got somehow fixed in some version, but I was wrong.