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Don't be an idiot like me and do this on Hard, save yourself the agony and do it on Easy. You will need to make it through Episode 6 all the way until the last boss without firing a single shot. Keyword, Flashbang. Flashbang Grenades are going to be your best friend. To conserve them, use Flares to shield yourself from oncoming Taken and then sprint away from the danger toward a safe haven. If you don't have a Flare, or come to an unskippable amount of enemies, Flashbang them. And run like the wind.