Experience Tumblr like never before
Look at the harnesses on the Nazgûl' horses. Notice the Eye of Sauron? Now, look at the eye motif on Katya's top.
Proof positive of one of three possibilities:
a) Katya is a Nazgûl (and you thought they were all hideous under there)
b) Katya is Sauron in disguise
c) Sauron was Katya in disguise
Does this mean the techno frisbee things are two of the Rings? Where are all the others? Who is in possession of the One Ring? And who among us fan folk is going to write a genre-bending fanfic about it? (Okay, maybe not the fanfic. RPF is dicey territory to stray into. I'd happily write a treatment for a Go_A music video, however.)