From an old server:
Explanation: There was a Clone PvP where if someone entered, two clones of them would be made. Well, they bugged for me, resulting in a clone that slid along the ground like that. It couldn't be hit normally, but I could use Pressure.
From another old server:
Two swordsmen attacking each other with max aspd like that = win.
Another one, I fell off the level and couldn't move. This was in Gonryun Dungeon 2.
And finally, while I'm not of the opinion that the server is awesome in any
way, I just happened to catch this on the server select screen.