when you put the spectator mode, get into a mob and you change to another gamemode the arm moves across the window
The video is in spanish but it doesn't matter: http://www.youtube.com/watch?v=bfyBqpU41lY
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galaxy_2alex
I'm in creative mode, but when you move the camera, the particles move too.
You shouldn't be able to be in a mob in Survival mode.