Blood Star and the Horror of Leaving Town   The most effective horror road movies begin the moment civilisation disappears. Texas Chain Saw Massacre understood this instinctively. So did Wolf Creek and Duel. Blood Star is built on the same fracture point.   Once the road opens up, safety disappears. Distance no longer helps. As Blood Star finds its audience, it will be recognised as a film that understands why the road is terrifying — not because it moves, but because it isolates.   Stills by Beast Films