Magic down in Rohan

Ah, the great city of Edoras by night. So beautiful! Then this accured! What is it? Some kind of magic? It seems that way - for what beast is there (save for those of magic), who could create something so beautiful?

Maybe my cousins, the two blue wizards, are summoning me? Or maybe, this a sign that Sauron has yet to return again? ~Gandalf