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Frost quickly realized he was now the one that was played with! Lucifer fought all alone against him so he could give him the false sense of security, that there wasn't going to be anybody around him anymore.
All while Partner was secretly recovering her energies, assimilating the new Blood Powers she acquired from drinking Lucifer's blood at long last, and then preparing a precise, and deadly blow against his Slime Core when he least expected it.
At the very last moment, Lucifer managed to create this opportunity, and like a stealthy sniper in the shadows, Partner took the opportunity and pierced his Slime Core, shattering it into pieces.
CRAAAASH!
"UNNGGH… Impossible… YOU?!" Frost looked into the skies, finding Partner smiling evilly. "Y-You… Unnggh…!"