Hannibal began to paint a picture in his head of what Arya was saying. She had taken his instructions to heart and was making Arie from Arya.
"Arie Rivers is in hiding from these Lannisters." Hannibal wondered why, what did they want from Arya Stark? "What are the names of her brothers? Her mother? Her father? What is the sigil of her father's house?"
He had a load of questions for her. They would encompass even the smallest of details. Most, he thought, he would write down for Arya to answer, and then he would quiz her on them.
"Most minds won't think to ask these sorts of things, I know. Some might, however. It won't do to have you tripping over anything. The smallest thread can unravel the greatest tapestry. What does your father look like?"
Hannibal imagined that a girl so tied with her father as Arie and Arya were would be able to recall his memory instantly and in great detail. He needed to see how she answered this. The look in her eyes, the tone in her voice, her body language.