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If a convert ability creates a Hero blocking in battle or an Evil Character attacking then that character must withdraw to its owner's territory as a response to the convert ability.
Well, before I would have said it's not actually a Withdraw (the Redemption ability) but with the madness on Heal, there's just another !logic error in the way this plays out. To be consistent with Heal, Asahel just kind of chills in battle looking awkward.