I finished LoTR: The Fellowship of the Ring yesterday. Great novel, but if I ever read it again I'll skip the first 150 pages of hobbit only adventures. lol. After that chunk the book turned out to be great. And the fan theory about Gandalf telling them "fly you fools" as in get to the eagles is debunked to me. Theory:
In the novel the word 'fly' was used as the word run in multiple instances. It was just the writing style. I'm glad they kept that scene like that in the movie, but Gandalf had no secret meaning when he said that. He was simply telling them to run for their f*cking lives or they'd all die in Moria.