This is a tug-of-war that consumes time, energy, and effort, with no end point and no compromise!
Song Ge is Xu An's pastime and his life-saving straw.
In the repeated injuries, Xu An found a way to keep Song Ge, that is, compared with hurting Song Ge, hurting himself is easier to make Song Ge's eyes stay on him, obscure and painful. Only in this way can Xu An feel that he is still alive.
Conception: