Zheng Yichen possesses the ability to influence this world, which is why she can invade it and eventually implant the information of the Old Dusk.
Otherwise, she could not have done this in Tia's presence. Without Zheng Yichen, Lilith would have no chance of initial operation after rebooting and would be directly erased by Tia.
Throughout the process, Tia didn't even need to make any move. The reason she fought with Zheng Yichen was their equal stature; even though Zheng Yichen was at a disadvantage, the rule-level power Tia could influence could not directly take effect on him.
Under the circumstance where both parties possess near immunity to rule influence, close combat is the best method.
By breaking each other's defenses through close combat, they can directly exert the power that affects the opponent inside their body, which is considered an effective attack.
Otherwise, even if they smashed each other into molecules, it wouldn't be considered an injury.
