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The video begins when Rihanna shoots a man making his way through a busy train station. After committing the crime, the camera focuses on the shot man and later Rihanna flees the scene. To create a timeline of events leading up to the crime, the video travels back in time to the previous day, when the singer is seen riding her bike and meeting with people in Kingston, Jamaica. There are also scenes of Rihanna alone inside a bedroom at dusk. Then at a nightclub, Rihanna begins to dance and flirt with another club-goer, who's actually the man that she shoots at the beginning. After she leaves the club, the singer's dance-floor partner follows her outside and begins to get violent. The video then cuts straight to the scene of a disheveled Rihanna crying in the street, after what appears to have been a sexual assault. The video concludes with the singer running to her home where she grabs a gun hidden in a dresser drawer, then that's when they replay the beginning when she shoots him.

Source:  http://en.wikipedia.org/wiki/Man_Down#Background_2