Improved Leader of the Pack

From wow.incgamers.com

Talent: Improved Leader of the Pack
Effect:Your Leader of the Pack ability also causes affected targets to have a 100% chance to heal themselves for a % of their total health when they critically hit with a melee or ranged attack. The healing effect cannot occur more than once every 6 sec.
Statistics: Rank 1 = 2%, Rank 2 = 4%.