Because he noticed that his assimilated zombies could see their previous kind, along with the fact that he hates these annoying guys, he stopped his mischief and started catching Evil Spirit zombies and forcefully assimilating them!
He did this just to create more Silver Armor zombies which he could fully control, so he could massively slaughter the Evil Spirit zombies.
Since Evil Spirit zombies are also zombies, they can't be infected a second time. The mutated anti-life substance in Tang Ye's body only stays in their bodies, not actively devouring the cells of the Evil Spirit zombies. Therefore, Tang Ye could only slowly evolve and assimilate with the anti-life substance within him, a process that takes a long time. It was only today that he assimilated around a hundred Silver Armored Evil Spirit zombies.
