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the victim probably said the name of the perpetrator, who she had met earlier at a friend's apartment. i have read several studies demonstrating that NO ONE intervenes if the woman says the man's name.
yelling "help" is more effective when a victim looks someone in the eye and orders him or her, personally, to help. otherwise diffusion of responsibility can occur.
by and large, the best way to get people's attention, however, is to yell "fire" followed by "call the police".
this is a sad reflection of our attitudes towards abuse and violence. i guess some part of us thinks it's "ok" for someone to abuse his or her spouse or partner.