I've been doing some attempts on heroic Council this week and have noticed during it that I have yet to be targeted by this ability. I'm not sure if this is just a fluke and I'm incredibly lucky in comparison to the other 3 ranged in my raid group.
At this point I'm assuming this is a shadow only benefit, similar to that of Mistweaver monks on Tsulong regarding Nightmare. Wondering if anyone else has seen this same result, or has been targeted. I'm also curious if this applies to healing priests at all. (I've not had the opportunity to try it while healing).
As of currently I've considered using this to my advantage in being able to better position myself to instantly root one of the adds, (likely would be the sole melee in our group targeted as the best focus for rooting). However I'm not 100% certain that this is how it works at this point.
We've been going off the assumption it was the furthest melee and furthest range who are getting chosen for the ability, but the few runs we did with me being the furthest one out I was not chosen, which is what made me start looking at this a bit.