it's the same pose she uses to seduce him in that scene I just read

和她引诱他时的动作是一样的
after their fight: "I feel sort of romantic tonight."

他们争执之后她说今儿晚上我觉得有点儿浪漫的那里
She is acting out a form: in the first case the form of

所以前面说的那个场景那里洛是在做戏
romantic fiction, the heroine who swoons back;

以陈腐的浪漫老一条装作是个迷人的女主角
in this scene the form of the game, the perfect form of tennis.

这动作在她打网球的时候是完美的发球动作
And he says she did a perfect imitation of top-notch tennis.

所以他说她有青年女子冠军般的完美的姿态
This is on 231:

第231页
"Her form was indeed an absolutely perfect imitation of absolutely top-notch tennis,

她的姿态确实绝对完美地体现了绝对第一流的网球运动
without any utilitarian results."

没有任何功利主义的后果
It's perfect tennis, but she never wins.

确实是完美的网球技法但是她总是给打败
And he reflects on 232:

第232页他认为
"Had not something within her been broken by me

要不是我捣毁了她内心的某种信念