On the way to the upside-down frog, there is a vertical cave with some teleports. A frog falls in freefall through the teleports, and there is a shadow biter (those creepy mask-ish things that live in the dark and kill you). Usually, there are fireflies that are used to get past the shadow biter, but since I backtracked with a molehill, the fireflies aren't there, so I can't advance. On top of that, the map bird won't come because I'm underground, so I can't move. What do I do??