It's almost certainly latency and lag causing this. You're actually dead before you jump, the game just hasn't told you yet.
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This could solve many of the times, but I've also been floating across a map and someone got FoH far below me and I got hit with it high in the air. And I was really up there. Maybe it was a fluke, maybe FoH doesn't have a ceiling. All I know is that one time was crazy because of how far I was above it and I hadn't been on the ground for quite some time.