When you critically heal with a single-target direct heal, you summon an Ancestral spirit to aid you, instantly healing the lowest percentage health party or raid target with in 40 yards for for X% of the amount healed.
When you critically heal with a single-target direct heal, you summon an Ancestral spirit to aid you, instantly healing the lowest percentage health party or raid target with in 40 yards for for X% of the amount healed.
The second target will be healed for up to 30% of the total healing done to the first target, including the 150% critical effect multiplier.
Ancestral Awakening currently benefits from Purification in a rather peculiar way: the 10% bonus is applied to the healing done by the spirit. Since the 10% bonus was already included in the heal that proced Ancestral Awakening, this means that the talent effectively gains the bonus from Purification twice, healing for 11/22/33% of the original heal.
Edit
Patch 3.1.0 (2009-04-14): This talent now accounts for your ineffective healing, rather than effective. 
