If you cast boon, and a healer has skin on the way, you will get both buffs. however due to the "fix" boon gets consumed on the next swing that is blocked, however skin absorbs any dmg that would have went thru so boon heals for 0 because you took 0 dmg after the block. simply put, skin nullifies boons heal but boon still gets consumed. the block isn't 100% true but you still block more often then not once you buff with boon