The external plate armor and the internal structure of a starship were two absolutely different concepts, as different as the hard skull and the soft internal organs of a human, not to mention that the 'internal organs' of the starship had already been churned by the wormhole bomb brutally.
The head of Infinite Fire, like the sharp edge of a blade, ripped apart a lot of critical cabins in the middle of Black Swirl easily. Boosted by the incessant impetus, it even managed to blow Black Swirl off its original course and force it to revolve slowly. Black Swirl could not get rid of the spiral state at all.
Bai Xingjian was even crazy enough to turn on all the weapons on Infinite Fire during the 'negative-distance contact'. The unstoppable high-energy particles as well as the destructive mystic rays and bullets of spiritual energy ran, roared, and exploded in the stomach of Black Swirl, sweeping everything in its way!