Fiora's Ultimate

I've noticed that Fiora's Ultimate is activated even when she only take off passives of champions like Anivia, Zac or Aatrox. Normaly they aren't dead, but the heal still get active and heals her, making even harder to kill her when the champions respawn. I haven't tried with the guardian angel. I'm telling this even being a Fiora player, I just want the game to be balanced. (Sorry if they are mistakes in my English)