In a demo at Gamescom, Designer Michael De Plater showed off a scene where Talion, a ranger who exists between the living and spirit worlds, finds himself facing a giant, angry Graug in a dark cave. Powerful as he is, Talion can't face the beast alone yet, so his only recourse is to run. Talion's ghostly guide, the elven ringsmith Celebrimbor, offers the following piece of advice: "Fly, you fool!"
This mirrors the last thing that Gandalf the Grey says to Frodo and his companions in the Mines of Moria near the end of The Lord of the Rings: The Fellowship of the Ring. The line was brought to more public fame in the 2001 film, and it plays an important role in speculation concerning the eagle plot hole in the series. Also concerning hobbits.