[The Penguin]

In other situations where two people hate each they are less direct about it and the worst things they say about one another are to other people and when they in the same room there's an uncomfortable pretence of not hating each other.

Perez and Katie openly can't stand each other. There's something oddly refreshing about that. There's no possibility of them being two faced to one another because they love insulting each other to their faces. They've crossed that line ages ago.