Game Mechanics: Slam stun on fleeing mobs

[Brut]

Whenever you score Slam on an NPC that's fleeing, it is stunned briefly, remaining still, but then proceeds to warp forward the distance it would've walked during that time. Sort of making the stun useless.

Is it a client thing that can't be fixed? =<

EDIT: Useless in the scenario described. Not useless otherwisely! I still loves my power to interrupt some spells. =p