The Mental type Demigod, influenced by the Black Light, made it impossible for those present in the battle to further observe how bad the mental state of their allies had become. The two Luminous Holy Maidens had purification powers, yet the fluctuations from the burst of combat affected some of their perceptions.
They were not professionals of the mental type, unable to immediately and accurately determine the extent of their allies' poor mental states, and moreover, the Black Light and Asura Battle Intent that Zheng Yichen had cast were targeted.
Paired with an extraordinary mental perception, the Asura Battle Intent and Black Light he released had actually become feedback-based; whoever bore the malice Zheng Yichen had marked would be specifically affected by the Black Light and Asura Battle Intent.