Two heads collide
Quinn wasn't a master of Qi, nor did he understand all the things it could do. He was even unaware of how Lucy, Layla's mother, had been able to give up her own life to heal Layla at that time. He had been sure that all the effects on Layla would only be temporary.
However, since it hadn't disappeared after all this time, it should be safe to assume that it would stay with Layla. Additionally, since she had never trained her own Qi apart from what little she had done with leo, there should be room for her to improve. From what Quinn had heard, Leo had said that she was a slow learner.
Even with him using all his knowledge, it would have taken her half a year to show any type of results. Which was why Quinn had set up a test, a test for her to fail.
Right now, checking her, it looked like the Qi vessel was ready to burst at any second.