What is a dead grey mob?

I’m running alts through dungeons, and after killing 10.000 mobs I saw this one mob not falling down to the ground and turning grey.
What does that mean?

(https)://ibb.co/2yVKS4v

Visual bug, or died without you guys tocuhing it, fighint with something that could have turned it in to stone
But probably a visual bug

Visual bug, indeed. Or, it got very scared.

It’s dead, Jim.

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