Precipice Hours (2014)

A nightmarish vision of a post-apocalyptic England where the fractured factions and tribes of the new world try to cope with the chaos that has ensued from a worldwide collapse. Four prisoners, and thus slaves to the most prominent faction 'The Front,' escape their buildings only to be hunted down by the gas-mask-donning assassin, known only as 'Duma'. As they flee through their memories, dreams, and nightmares, the figure follows them through the wilderness and battles whole factions, leaving a trail of corpses in his wake. The Writer (one of the prisoners) is reunited with his sister only to have her find her way out of the island, leaving him damned and broken as the figure destroys the civilization he longed for.