I have been looking for a movie I saw bits of some years ago, the plot revolved around a death game situation with a bunch of rich people watching a hunter (who was I think I remember him being either an albino or having some issue with light) hunt a bunch of people through a vast forested area. I remember that the protagonist was female, and I think that each prey had a piece of a gas operated grenade launcher (pic related) with them, which the protagonist eventually gathered, and assembled but the hunter hit the gas canister while she was running rendering it useless. She eventually managed to kill him and escaped but I don't remember many details, I do however remember the last shot being of her running on train tracks while the camera is chasing her as if it was the train. I'm guessing it was a less well-known movie (none of the well-known blockbusters or I would not be still looking for it) and I have high hopes some anon might know it.