```
He staggered backward as if struck by a heavy blow, and a dense black fog suddenly emanated from his body, enveloping him in endless agony in an instant.
Shen Yanqing groaned, his eyebrows tightly furrowed as he clutched his chest in pain.
This sudden transformation caught Sangmo off guard; she instinctively reached out and grabbed Shen Yanqing's arm.
The light patch remained on Shen Yanqing's chest, continuously emitting black smoke.
Sangmo stared in a daze, as if she had discovered something inconceivable.
Her hands trembling, she unfastened the Purple Light Mirror from her belt.
As the black fog dissipated, Shen Yanqing's forehead was covered in fine beads of sweat, and he stepped back weakly before collapsing straight down.
Sangmo quickly supported his waist and silently looked into his eyes.
