@Lilkanyon,
I would still love to get your answer.
Let's take this conversation:
Bryan: Is that an old photo of your friend?
Cathy: No.
Bryan: Okay, I always think about that person on the picture, who I thought was your friend. But they are not the same then.
Cathy (looks closer): No they aren't.
What is your interpretation of Cathy's last sentence "No they aren't"?
a) "No, (I was wrong), they are the same (person)."
b) " No, they are not the same (person)."