Cannot kill Bull and Gouger in the quest "Confidence Man"

Cannot kill Bull and Gouger in the quest "Confidence Man" - Man Riding on Bull

I am inside the brewery with Travis but I cannot kill Bull or Gouger. They seem to be marked as essential, as when I kill them they simply just lay down for a while then get back up good as new. I don't really want to use the console or cheat by modifying the quest stage, is there another way to get around this bug?

fallout-4

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