A lot of people have said it, but this is a very common bug. It's usually caused by entering a zone at the same time as someone else, but not always. When you loaded the zone, you didn't get the information for this player for whatever reason. You can't see them, you can't /who them, and if they kill something you'll get the unseen hand message. They will show up on /who all though, since that's looking at server info as opposed to zone info. If you camped out and back in, you'd be able to see them fine.
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