The girls were a little stupid...
Even though I think both of the girls were terrific actors, I think their script was a little unrealistic despite being a great and in some cases, REALISTIC movie. She had a gun... he was on the floor... she knew he wasn't dead... she left him. Who does that? She just saw her friend get brutally raped and she just leaves him there, not only that, but WITH the gun???
It's ridiculous. It ruined an amazing movie for me. What I think should have happened is she should have caved his scull in with the end of the rifle, and since it's not as brutal as what originally would have happened, they probably could have added a few more violent scenes to fill it out. Yeah it would have made a short ending but I think if they showed the two girls trying to desperately escape into the outback afterwards, it would have lasted the movie a bit longer and definitely make the ending more satisfying. Who knows one of them could have died due to pure dehidration. They could have also made the guy more interesting too, i.e the dogs could have escaped their cages and bye bye.
That's how I would have liked it, anyway.