He couldn't understand why she would build walls around a castle this deep in the sect. He wasn't even sure if a wall would do anything to stop intruders that can fly. But he didn't voice his doubts.
He felt that he was a guest in her home and he was here to seek her help, so the least he should do is not criticize her house. It is just basic courtesy.
Taking courtesy further, he complimented her house, "Nice place you have here."
She said, "Thank you. I'm glad you like it. I modeled it after one of the castles you described in your books. Can you guess what castle I copied?"
He thought to himself, "So this was my fault."
She urged him, "Come on. Guess. Guess."
"Let me give you a hint. No flight is allowed around the castle because the walls have been enchanted to suppress flight."
His eyes lit up in recognition. He said in understanding, "Is that so? I see."
