The Heal and Stacking in Age of Conan
You do not have to target anyone to cast this spell. The big heal area of effect is 8m in a radius around you, that means people behind, in front, beside you are all healed. If you have a Demonologist, or have an empty slot to create one and an aoe spell they get sort of early on called Shock blast, it is an aoe 8m radius. Center the targeting pad on yourself and that's the range on your big heal in game (aoc gold).
Now, see that is not necessarily a good thing, when you cast your big heal to heal one person, anyone else caught in that radius will also be healed, whether they are at 99% health or 100% health, you will heal them. Now when you heal them you will affect them with a rebuff that is linked with your classes (age of conan gold) big heal as shown above.
So when a Bear shaman affects a team member with Fierce Recovery, and in turn rebuffs them with Adrenaline Surge, no other Bear shamans can heal that person or anyone else with the Adrenaline Surge Rebuff. So you can see where these causes a problem by using your big heal at the wrong time. This restriction is only to your class in AOC, so if a Tempest of Set casts a Vitalizing Jolt it has no effect on your Radiance if you are a Priest of Mitra.