Ling Mo wasn't familiar with medicine or biology. The method he used to examine the body was simple and rough: dissection!
Ling Mo didn't want to make his shelter dirty and decided to make Ye Lian drag the zombie into a private room inside the teahouse. Xia Na then made the move and slitted a deep, large opening.
Although Xia Na wasn't under Ling Mo's control, she was still one of Ling Mo's "zombie puppets" and she could listen to simple instructions. Not to mention that she was still sane to some degree, she could understand his words more or less and thus, she could easily cut open the zombie's body for Ling Mo.
Xia Na demonstrated her zombie-like personality in a situation like this. Her expressions were cold and calm without any fluctuations of emotions as if she wasn't cutting open a human body.
When the heavy smell of blood spread in the air, her eyes even flashed red.