After the duel, Yi Chen's doubts were finally resolved, understanding why the Ninth Disaster was given the name "Undead" and why William was so invested in the matter.
The zombies outwardly appeared as weak as ordinary people, yet they still reached the "Disaster Level" because of an infection that transcends rules.
To make a simple comparison,
The Fourth Disaster—Gap's "Concept Rigid," evaluated as class A by the Lighthouse Mental Hospital, ensures that anyone who kills Gap, as long as they harbor the 'seam' concept, even those elusive Thought slits or memory fragments, would facilitate Gap's perfect rebirth.
Only someone like Yi Chen, who can completely shut off Thought and rely entirely on the primordial instincts of an assassin, can deal with him.
