No, I think the guy sniped you, but the lag meant that it didn't register until after he had been killed by you. He probably got a post mortem medal.
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He didn't get the kill though. Even if someone gets a postmortem it will show up in the feed
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Well that's the thing though. Because he was already dead when she somehow fired the shot, they system couldn't determine who killed who, so it resorted to a simple "[insert here] is down".