Was there a time Gilgamesh had been this furious? Probably. The time when the gods had taken his best friend from him. The time that Arturia was forced into attempting to destroy the holy grail. The time that insolent dogs had attempted to kill him. 

This mad dog had reached him. This mad dog had broken through his defences and dared to challenge the king. Perhaps there was some amount of worth after all. 

But it would not be enough. 

He would praise her for it. To think that she would actually push him to utilize such a weapon - even as he simply brushed aside Pandora's box without the use of Ea, this was something that he could not stop without the use of his most trusted weapon. In hindsight, to use it against such a brute like this girl was ironically fitting, considering that the most well known use of the chain by his friend was to restrain the brute beast known as the bull of heaven. 

And with that, the King unleashed the "trick" that Mia taunted him to use. 

"Bind and restrain, [b][i]Enkidu[/i][/b]!" 

From the very air around them, emerging from the Gate of Babylon that simply "existed", the chains that bound the gods themselves wrapped around Mia. Enkidu itself was much more than a simple physical chain; it was something that bound the very gods that gave birth to Gilgamesh. There was no dimension, no physical nor any spiritual escape. The chains did not simply physically restrain; it was a divine, conceptual weapon that trapped the very concept of "Mia" where she stood - physically, dimensionally, spiritually conceptually and emotionally. Even among the many countless civilization ending world creating weapons Gilgamesh possessed in his treasury Enkidu, along with Ea were the only two weapons he truly felt any worth having. Raising his finger, the chains pulled Mia's hand which had dared to defile the King's glorious body away from him. 

"...you have done well to reach me this far. By penetrating the defences I have set up against most opponents, you, mad dog you are, have earned a small modicum of the King's respect." Gilgamesh spoke to the bound and trapped Mia even as he took out a golden axe from his treasury and held it to Mia's neck. "In recognition of your achievements, your efforts, I shall grant you a small mercy. After all, I am a generous king." Gilgamesh grinned. "In recognition of your achivements, I shall allow you to plead for mercy. I shall allow you to plead for mercy right now, to ask for forgiveness for daring to try and limit the power of the King through your treachery which I have easily overcome. Then, I will forgive you for your insolence and allow you to keep your life."