So i finished one of the longest runs in Torghast, was about 17 floors, anyway Bolvar sends you to find clues to Anduin's wearabouts.
After you get these clues, this interaction ensues.
In the quest Blurb after I hand in, Bolvar says that we cannot allow Sylvannas to carry out her plans. Then this interaction between Thrall, Baine, Jaina, Calia and Bolvar takes place.
So what's the deal? they trying to corrupt Anduin? What makes him so special?
Fyi: There's a cut scene but they don't show it, just a place holder. This activates after Bolvar tells you to attune to the helm so he could peer inside the maw.