Fantastic closing line! Your writing is so evocative, especially describing the different shades of light and so on.

And your Joker is just fabulously evil and twisted! Was it a conscious decision to turn Batman into Bruce here? The only time I can meld the two personas together or see hints of Bruce in Batman is when he is interacting with loved/trusted ones such as Gordon or Lucius. In my mind he will always stay in Batman persona whenever the Joker confronts him so I can't see him giving in easily to whatever mindfuckery the Joker unleashes on him.

Still, this is a fabulous fic!