Li Shi wouldn't sit idle and copy the handwriting of someone with such a low level of skills.
Sister He is Wu Yuan's best friend and her connection in Shanghai City. Wu Yuan has sung his praises numerous times in front of her. To reciprocate her kindness in introducing him to a picture framing master, he decided to go all out in giving Sister He calligraphy guidance.
When he "reviewed" Sister He's handwriting for seven to eight minutes, he was observing and gauging her handwriting characteristics. At the same time, in his mind, he based his modifications on the Yan style he learned and referred to the calligraphy of her aunt to improve her handwriting.
If we regard Sister He's handwriting as junior high school standard.
The first time Li Shi wrote, he replicated her handwriting, which was 99% similar and hence naturally at a junior high school level.