The law of equivalent exchange operates with precision, assessing the value of what is offered. Consider a scale: if one places one kilogram of bricks and one kilogram of feathers, the scale remains balanced; however, the removal of even a single feather causes an imbalance favoring the bricks. Similarly, a clone represents a carbon copy of the caster and is endowed with only 50% of the caster’s abilities. Life is not attributed to the clone, as its existence is sustained solely through the caster’s mana. Consequently, a clone can be regarded as possessing half a life, and it cannot be exchanged with another life, as such an exchange would violate the principle of equivalence (=・ω・=)

Can’t trapping a clone of his dispel the aqua prison? Is it because he doesn’t want the mask to break, since he’s using it to live a double-life? Is it because the prison won’t recognise it as a legitimate prisoner?