During the brief conversation in the elevator earlier, Yi Chen seized the opportunity to test out just to what extent this Vice Dean, known as "Neurological Sense," could apply his sensory abilities.
Even if his eyes were gouged out, he could still form images,
so he indeed could easily transmit the Death Symbol throughout the city, and only someone like Zede, who was deprived of fundamental vision, could be immune to the symbol's visual transmission.
The only way Yi Chen had to block the transmission of death was one.
That was to activate the "Needle Chain's" painful trait, covering his body with needles that symbolized pain, ensuring that wherever the Vice Dean's sensory lines tried to penetrate, they would be broken by the needles.
Moreover, he could transmit this pain back as well.