Is this the consequence of twisting one's tendon?

Qin Wanru looked in astonishment at Qin Yuru, who was in front of her.

Her face was still the same, despite being a little distorted. Her body also looked fine and she had just reached out her hand to hit the servant girl and knock her down to the ground. Her legs and feet were also fine and she stood there steadily, as if nothing serious had happened to her. Indeed, she was not seriously injured.

The ...