Quote:
Originally Posted by ThaVirus
Yep, that's what I was referring to. It was in Unexpected Journey; I remember now.
It didn't do anything to further the plot but I'm assuming it was just a nod to the book. A little bit of fan service.
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It's also what chased them into the caves, iirc, where Bilbo eventually finds the ring. Otherwise, they would have just gone through the pass and been on their way.