ok im not sure if i read this wrong of what but i play pvp alot and what actually happens is ; you engage into combat with a fury ( or any other healer type for that matter ) unless he/she goes into combat ( auto attack , nuke , dot , debuff ) his/her power / hp regen will stay as if they were out of combat.
so what common tactic to do ( which i have done many of times ) is to let people attack you and waste power using Combat abilities thinking they are winning but little do they know your power and hp are still regening as if you wernt in combat. when they are low power you can strike! bang! nuke! snare! dot! nuke! root!
and you win still very high power and hp
ty -