The silver and black lines represented each other's soul.
These lines encircle the spiritual energies of both while gradually making them come together.
As this process began, Shi Yue was stunned to notice that her soul was being submissive to Tang Yin.
'What?' She thought in shock as her eyebrows trembled slightly upon witnessing this.
'Is his soul that powerful? No, if it was, he wouldn't have been so affected by the Bloody God's Domain...' She thought, and her brow furrowed slightly.
She could tell that her soul was being submissive to Tang Yin's soul as the spiritual energy mingled. But it wasn't because her soul was weaker.
If not because there was something about his soul that made it look like something of another category.