Crabs seek revenge upon a monkey for wounding their mother, and are aided by a mortar and cow poop.  A divine oracle leads a man to riches.  A man's head becomes the scene of strange happenings.
So they all hid to ambush him.
Entonces todos se escondieron 
para hacerle una emboscada.
así que se escondieron para 
tenderle una emboscada.
Então eles se esconderam para emboscá-lo.