Aren't You Forgetting Something?

Grey continued staring down at Nathan and shook his head. 

People will always resort to anything when faced with death. He knew from the start that Nathan was not someone who had resolve. As long as things weren't going his way, he would change. 

From being a respectful genius, he tried to stop people from helping Grey because he was beaten up. Now that he knew there was no way for him to win the fight, instead of going down with his honor, he wanted to cripple himself to ensure he didn't die. 

Grey was the one who gave him this choice from the start, but since he refused then, it was already over. There was no way he was going to give him the chance again. When he thought about it sincerely, he realized he made a mistake, as long as he wanted to kill Foudre, then he had to kill Nathan since he was the one who sent Foudre after him. 

It was like wanting to kill an assassin, but forgiving the person who sent the assassin to kill you.