It is absolutely ridiculous trying to complete this quest using the last word. Especially since the meta is so special heavy. The amount of kills you have to get in a row without dying to move up 1% point is unrealistic to most of the community. Majority of the time I sit at around 35% on it and then next thing I know I'm back down to 0%.
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Is it still kills with the last word EQUIPED? Go into mayhem clash, you'll have it done in a day