Lag, Fail, Teammate, you name it. Video evidence is always best.
(It's hard to explain lag deaths without a video. "Uhh well I popped my super then he kinda body-slammed me.")
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This morning I fired three Truth rockets. All three hit the same player, but he still didn't die. Then he killed me while I sat there gawking at the screen in disbelief. I hate how I do everything right and still lose. One reason I'm not a big fan of the crucible.