Aggra:I should have known! The Twilight's Hammer knew we'd be here! Defend yourself!
Having gone through this quest chain a few times now I have this irking feeling that the quests were modified after the dialogue had been recorded. I see absolutely no evidence or sign of the Twilight Hammer. It would take a very wild stretch to interpret "Corestone of Patience" and "Element of Patience" into "Twilight Hammer minion".
This on top of the fact she makes repeated remarks half way through previous phases about "bracing ourselves" and the what not makes me think that Blizzard originally had a different idea for these quests but then changed it before release and had no desire to re-record the voice acting.
Aggra: We need your help! Do something!
With a bunch of neutral elementals around us seems very out of place and I think supports this theory. I have a feeling the originally intended portion of this quest was to have waves of Twilight Hammer cultists attack with increasing intensity. In the end it was changed to this split of the elements concept.
Despite some interesting lore I found this whole quest chain to be exceedingly dry. Four rounds of the exact same quest with mobs that are obnoxiously high tuned. Not to mention it feels really awkward helping Thrall as an Alliance member. :-\