User blog:Waters Knight/Weiss killed 'herself' in the White Trailer

So... I was roaming around tumblr, looking at some RWBY stuffs... When I stumbled upon a post by a person who noticed something in the White trailer, just as Weiss is about to deal the finishing blow to the Knight. For literally a split second, at one frame, if you look into Weiss' eye... You see a reflection. A reflection of Weiss.

I know Monty hinted that the Knight was 'someone' she felt she needed to beat.

Then the lyrics: "Mirror Mirror, what's behind you? Save me from the things I see! I can keep it from the world, why won't you let me hide from me?"

Mind. Blown.

I double checked the trailer myself, and while this specific frame is extremely hard to catch, I can confirm that this isn't photoshopped or whatever.

Any thoughts/theories on what this could be?