The final movement of this film pares the cast down to two characters, the black man played by Tory Kittles, and the white cop played by Mel Gibson. As they square off, two opposite and apposite figures on a desolate, bloodstained field of battle, one might recall apocalyptic images from other films: the ending of Carpenter's The Thing, or the rueful climax of The Hateful Eight. Those films reached troubling images of dis/unity in the aftermath of violence, perhaps in…