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About the Achan's Sin example, first of all, it says remove, not discard; and second, it interrupts before it removes, so Panic Demon would be interrupted and not work.
What would happen if I placed a the PD on my opponents hero, and then that hero got returned to their hand? would the PD follow the hero and go into their hand?
The Pale Green Panic Demon says: If rescue attempt fails, you may place this card on a Hero in a territory. Hero cannot enter battle while this Panic Demon remains. May band to Panic Demon.If the Panic Demon is 1) discarded2) removed from the game3) Set aside4) Captured5) Returned to Handcan I place my the card on a hero?