A heavily silence falls after Mu speaks. It's either reluctance from his part or he is trying to come to a decision. While he never had intentions to join the game and he found rather appalling given how it is to be carried, he wasn't a stranger to violence and there was something else about him. Maybe there wasn't a raging fire in his eyes but he could be a little competitive which is why to him there is only one clear response.

"No."

Giyu wasn't going to simply surrender, even if it was contrary to him wanting to no longer participate. As far as he could see there was nothing to be gained here but he can't just give up either. "In order to leave..." He would look down reminding himself this isn't simply a field. "the board the piece must be defeated."