#1 - Dec. 9, 2011, 12:52 a.m.
Blizzard Post
In the 25-player for Spine of Deathwing encounter, on Heroic difficulty, Blood Corruption: Earth appears to be triggering Astral Armor instead of the intended Blood of Neltharion. This issue will be corrected in patch 4.3.2.

In the meantime, we can confirm that Astral Armor is correctly providing same effect as two stacks of Blood of Neltharion.