He thinks the chains can bind her. That somehow they will allow him to posses, own her. He can force himself upon her, take her body, make her moan in ecstasy. She can hungrily cry out begging for more. The pleasure , the heat, the moisture crashes over her like waves upon the surf. His bodily pleasure is unending; she could almost forget the years of pain, almost forget the years of neglect. She could almost lose herself in this amazing heated embrace... Almost... Almost.

Eventually, he will spill his seed into her and then the power has shifted, the power has become hers. The physical bond will be broken and the magical spell lifted.
Chains crash to the floor, sirens screech pierce the hallows of the echoing halls. Her wings raise her powerful body above his "Power is not in the control of the body, but in the control of the mind". 
She beats her wings harder, debris flying through the cave, he cover his face to protect himself from the talons that have escaped from her limbs, but she ignores the man at her feet, for he too has long forgotten of what mystical creatures hold true. "love is the only binding agent; it is the only strength and it is the only weakness." Storm Hawk takes her escape across the winter milky moon.