http://www.pcgamer.com/shadow-of-war-interactive-live-action-trailer-depicts-the-nemesis-system-in-motion/

After teasing its beastly Feral Tribe last week, Shadow of War's latest short puts you in the driving seat. The question is: do you feel like slaying or saving?

That's something you can answer in the following 'Friend or Foe' interactive trailer, which recreates the game's esteemed Nemesis System, and ends by letting you decide the fate of your Follower or Nemesis.