Manoeuvre.

A man (psychopath), walking around isolated roads at night, encounters a woman who triggers off his childhood memories of torturing and killing a rat, and further leads him to slash another woman - a hooker to death. He has another encounter with the first woman, this time interacting with her - albeit in an unusual manner over a game of SCRABBLE. This leads to passion between the two and... it is the woman who is seen washing up and cleaning the blood off her hands.