When Ah Fei was in the thrall of Lam Sin Yee, he was obviously not the great swordsman that he had been before he encountered her. Just how much of his prowess did he lose during that period, though? We know that in his compromised state, Ah Fei could not beat Ging Mo Meng, but that doesn't mean that Ah Fei was helpless. Just how much of his ability did Ah Fei lose?
Additionally, after Ah Fei came to terms with the reality of Lam Sin Yee's manipulations, did he merely return to his old, pre-LSY level, or had he advanced beyond that?
Finally, most of Lam Sin Yee's manipulation was done emotionally, but wasn't she also drugging him? Did the psychological boost of rejecting Lam Sin Yee also somehow take care of the harm that the drugs were doing to his body?