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I know I have seen a trailer for this...
From what a I remember a killer takes a woman, or women into the "woods" and forces them to do very intense acts of violence to one another. I think he has the daughter of one of the women, and it drives her to be able to do what she does. The trailer had some intense gore and pulled no punches with any of the acts of violence. I think it was even supposed to be based on "actual events" but I could be wrong there too.
I also think this was from Down Under, but I could be wrong. Of course it is not Wolf Creek!