The blindness that opens the eye is not the one that darkens vision. Tears and not sight are the essence of the eye.
The interesting thing about Hain is that he's not a very interesting character. He's not fabulously clever. He's not a great policeman. He's not hugely charismatic. I'd describe him as a kind-of Chekhovian character. He's an ordinary bloke, to whom extraordinary things have happened. Which is quite hard to play, I have to say.