There is an NPC on the Oblique pixelmon server (play.obliquemc.net) that, when battled, causes a glitch the instant said fight ends. The player's perspective is thrown a few blocks above the player's actual body and the viewing is locked. Moving the mouse at said point would rotate the players head but not the camera. All keyboard inputs expect for wasd are allowed, and chatting is also allowed.
The way I fixed this bug, was to teleport into the servers other world, Vanha (Pretty much switching dimensions).
Players spectating the battle also had this issue.
After changing dimensions, every occurred as normal.
This glitch can be repeated simply by engaging this foe.