Nilbog if it would please the court, this spell had different functionality in PvP vs PvE.
I think it was unresistable in PvE and sent mobs to their bind.
However, it is documented as having a brief stun and applying a very small shadow step to the player in PvP.
Its
data suggests that it is indeed resistable in PvP:
pvpresistcalc 135
pvpresistbase -62
pvpresistcap -78
Being a stun, it should make an all or nothing type of roll when making a check.
Right now it is counting the dispel as the primary component and making it unresistable, I believe.