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The Might of the leader of the vampire clan was not something that could be taken lightly, Frank knew this very well in these last moments he had been fighting Clementine. Her power was nothing but incredible, admirable, even. She was able to bring forth all his power out and even then, her entire body was incredibly resilient.
Frank had been inspecting her entire power this entire time, and had found absolutely no open areas, she was incredibly powerful to the point that she had NO WEAKNESS. Indeed, no matter how much he thought about it, Frank couldn't find a weak spot, nor a place of her body that was weaker, nor somehow a certain area of her body that her strength and movements couldn't cover.
Check "The Protagnist's Sister Is Actually the Strongest"!