What defines an ultimate skill? It's a martial art so profound that it's incredibly difficult to learn even with a dedicated teacher, let alone by mere observation. Even if one possessed heaven-defying talent, allowing them to learn simply by watching, they couldn't possibly grasp it without seeing the complete form!
Elder Chen remembered very clearly. The only time he had ever performed the Northern Sect's Eight Pieces of Brocade in front of Zhang Beixing was during the young man's last visit, when he sparred with Liu Yi. Furthermore, the version he'd demonstrated then was incomplete—just a move and a half.
How could he possibly have reconstructed all my moves from that one and a half forms, and so accurately too? Even if Yue Fei himself were reincarnated, he couldn't achieve such a feat!
"Nephew Zhang, making baseless claims is not a good habit!" Watching Zhang Beixing, Elder Chen reminded him.