I've been playing this game since Beta, and I have literally never seen someone get this medal.
I've seen two or three people with the medal in their profiles, but I know for a fact that these people farmed for it by matching teams of friends in 6s.
For those of you who don't know, the medal is rewarded upon the rapid killing of 4 enemies.
Why does Bungo put medals like this, Phantom, and Relentless in the game, when nobody can get them without cheating?
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Zone A lost...... incoming super...... zone A obliterated. Breaker/slayer medal achieved. Same goes for heavy. Instead of just using your super willy nilly save it for an opportunity. Will you die? Most likely... but don't come here saying people who have it cheated.