In 10.2, Solarys Thorngale and Kery'nael Thorngale are two Druids of the Flame who regret the path they've chosen, and who return to the Night Elves of Amirdrassil. Helping these two out rewards an adorable Battle Pet, Kal'andu!
In the Emerald Dream, Solarys can be found just outside of Amirdrassil, asking for help with her siblings, who like her, joined the Druids of the Flame after the Burning of Teldrassil. Most of them regret this decision — still scarred from Teldrassil, they joined out of pain, but have since been horrified by the violence they've seen committed.
When we find Key'nael, he's kneeling among the bodies of faerie dragon Lunarwing Darters, some still burning. The Druids of the Flame seem to be sacrificing these poor creatures in order to prolong their own lives, a tactic Key'nael can't stomach.
When we complete the quest, one of the rewards is the battle pet Kal'andu — a singed lunarwing juvenile that managed to escape the flame. Afterwards, we can speak with Key'nael to learn more about why the Thorngales joined the Druids of the Flame, and why they decided to leave.