It was more that a little heartening, to be honest, to have someone outside the Petrelli family recognize the evil that had been his mother's actions. It made Nathan feel a little less insane for being so furious and, now, even more hurt.
"Thank you, Cordelia," he said quietly. He was grateful she had understood why he had asked the question so he hadn't needed to explain more and grateful she would keep it to herself. Given Peter's reaction to their mother just on his own timeline, he did not need to take on the knowledge of another timeline of failure by the woman who had professed to love them.
"No, just bruised I think," he said with a sigh when she asked about his hand, shaking his head. "And she can go, she's not gonna get far if she tries to leave, the alarm set for her will make her indignant enough she'll just go to her room."
He felt oddly disconnected. He had grown so used to making excuses for his mother of his life, from the small ones like her personality, to the bigger ones like some of her actions, but now that was all gone. He didn't want to make excuses, he didn't want to defend her and he didn't want to see her again. Yet, he still didn't want her going off and getting eaten or dead.
"Thanks for unlocking the door," he said quietly and then nodded to the wall now sporting the aftermath of his punch. "I'll get someone to fix that too."