It was pointed out to me that defending characters only get to decide what area they are offering to be hit in Fight! when they are taking damage, not when they are being affected by none damaging spells (basically when their armor can act as a barrier between them and any damaging force) as a mage can be engaged with an armored opponent and said armor is made up of several items of similar material construction (chainmail for example) Binding ones opponents armor should be an allowable combat usage of the Binding spell.
Is there a BWG, RAW reason that this spell usage should be disallowed?