The problem is imo, that the game treats the orb as an uncontrollable pet, therefore not giving the player procs from its damage. It is necessary for frost mages.
Its not in english, so I didn't even bother reading it. However we have 4.3.4 patch here for a longer while. Still one of the most important talents for frost mages is bugged. Just bad.
Topic: 
World of Warcraft
