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As a follow up to this, what happens on a hero like War Officer that says "if defeated"? It doesn't specify "discarded". What if the defender played a card that is removing him from the game? Does he instead get placed in their land of bondage?
Defeated refers to any time a Hero doesn't rescue an LS in a battle that was at any time a rescue attempt, or any time a Hero is removed from battle, beaten by numbers, or ignored in a battle challenge. So if your opponent plays a card that removes, sets aside, ignores, discards, or captures War Officer without interrupting his SA, he will go to your opponent's LoB. Also, if WO's RA becomes a BC (Uzzah, DoU, etc.), WO can go to your opponent's LoB.