One Question!

There's a scene about mid-film where Szeto and Cynthia are in a room together. A little while after she returned his dead girlfriend's bloodied telegram back to him, I believe. She is at the window smoking a cigarette and he seems to be sitting on a bed across the small room. They are unusually calm and content with eachother for the events that have transpired. Szeto also wears an interesting expression on his face. What exactly was happening in this scene? What went on between them? What was it supposed to portray for their relationship to eachother?