This is often called "super bullets", result of lag mowing you down in a "single" bullet.
Watch this to learn how poor bungie's peer to peer multiplayer is https://www.youtube.com/watch?v=90RMYlWBe2Y
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Yes, ik know. Seen this video. Yesterday played a Supremacy match against 3+ k/d's. We were dead, before we could even pull the trigger. They just appear out of nowhere and kill you with one bullet. Only one player from their team was killable.