The once ferocious mysterious substance, upon being confronted by Bai Zhongqi's Supreme Command, appeared evidently terrified. But the more terrified it became, the more the substance it carried attempted to attack the shattered substance of the Homeland Titan, signifying a battle not of the substances themselves, but of the metaphysical entities they harbored.
The mysterious substance making up the Mechanical Behemoth, carrying a will akin to the Supreme Command, was indeed powerful; it could contaminate any object it touched, thereby assimilating it as part of itself. It was like a group of rioters encountering an empty house and then rushing in to occupy it.
However, the substance of the Homeland Titan was not an empty substance—it was inhabited.