For me it has to be 'nades. Gas! Gas! GAAAAAAAS!!!1!1!!!1
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I have seen YT vids of players in BF4 getting killed by being bopped on the head by a helicopter or being pushed of a roof by a jet. I would figure that that is probably the worst ways to get killed in any BF game. Yes yes, I know, WW1 did not have any jets or helicopters, and I find it weird they did not include them because they have so much of the other stuff wrong that they might as well.