If it helps, When I zoned in and did /who I saw prudent in the zone as well. I am Milkshake in game.
I'm assuming he didn't show up in the zone for you and killed you while you couldn't even see him.
I've had people in my group not show up for me in zone and one of us would have to re zone to see them again, weird bug.
I haven't seen someone get PKed with this bug yet though.
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