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If my Hero in the main battle is targeted for removal by a card in a side-battle, can I interrupt that card with a Good interrupt?
Dude, yes, I love the 20 page threads going in circles about rulings, especially when halfway through the opponents realize (at the same time) that they agree with the other side. And then they switch and argue for ten more pages. For what its worth I agree with Tim.
too bad you dont get paid for that tho.
Until the side battle is completed you cannot play any enhancements on characters in the main battle. Anything that happens in a side battle is an indirect result of the side battle card, so if your hero is removed in the side battle, the card that caused the side battle can be thought of as the card that is causing the removal so your hero gets initiative to negate it (after the side battle ends) in the same way it would if the card that removed the hero was played in the main battle instead of the side battle card.