I watched the meteor man parts again, and had headphones on. At certain points, there is some evil-sounding whispering in the air, kind of influencing his actions or something. I couldn't make out what the words were saying though
So do you think it is Gandalf, Sauron, or somebody else? Gandalf would befriend harfoots, but would not kill fireflies. Sauron would kill fireflies, but would not befriend harfoots. And either one would offend canon (especially Gandalf) although that clearly is not stopping them. Saruman? Bombadil?