Assassin spirit can become "Frozen" when silenced, stunned, fire-walled ETC during an attempt to toggle or un-toggle the ability assassin spirit.. The animation of assassin spirit toggled on appears (icon on action bar cycles), but the buff does not activate or refresh. When attempting to Re-toggle Assassin spirit (or De-toggle) nothing happens. The only solution is to exit combat and un-equip daggers and then re-equip them. Bug occurs frequently in arenas, gvg skirms, and during PVE when stunned by mobs while toggling/un-toggling assassin spirit just before the CC occurs.