Willie ventured into a cave for an unknown reason. Bork the Bold followed to retrieve him, but came across a Hideous Zippleback Dragon instead. As Willie hid behind a boulder, Bork fought the dragon, only to get fried - again.
Willie is rather shy and cowardly, as a sheep ought to be. Ever mindful of the dangers around him, he hides at any hint of danger, and this has kept him alive, while his sheep flock was eaten or Bork gets toasted by Dragons. However, we see he has a bit of a curious streak, as he wanders into a Zippleback den.
Willie, the last surviving member of his flock, hiding behind Bork The Bold.
Willie hiding behind a rock in the lair of a Hideous Zippleback.