I suspect you want to do something about it. Anything you do will probably make you fall out of a favor with both him and the girl. It's her right and responsibility to report it. Talk to and console her. Tell her she's the victim. In the end if she decides not to report it im afraid there's not a whole lot you can do without getting her mad. Making it public only makes it worse for her as most likely she's in some stage of denial or blames herself, your concentration should be on helping her realize its not her fault and not on getting into a fistfight.
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