The Mystery of the Floating Scorpid
There is, of course, no caster sword, but there is an odd shadow...
The only way that shadow could be cast there would be if the scorpid was in midair. And it's not moving, it's just staying there.
I line up my own shadow with the scorpid's and then turn until I finally spot it... far in the distance.
(I have it targeted, so the red name text is just barely visible.)
I fly in for a closer look, and, yep, it's a floating scorpid alright.
Specifically, a Ruby Venomtail. Somehow, spawned, oh, about spitting distance from the flight ceiling. At one point, while I was getting the above screenshots, I aggroed it, and after I flew away and it reset, I watched it move straight up in that jittery, jerky way movement-hacking PCs do. (I've reported a lot of movement-hacking bots, level 84s and 85s in Valley of the Four Winds and Jade Forest going from node to node and teleporting through midair on a ground mount.)