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As the fight between the Spider Empress and Kumo happened, Kuro had quickly confronted the Snake Empress, whose presence and size was even more intimidating than the Spider Empress.
However, unlike the Spider Empress whose body was covered by a hard exoskeleton armor, the snake had an armor of scales, which could easily bend, after the two first attacks from the sky, the enormous snake was left with enormous burnt wounds across its body, as rivers of blood leaked out of it.
Kuro and Kumo were wild monsters, they didn't planned through things as much as a person would do, although they had powerful instincts and great hunting abilities, they still went for the simplest method of attacking, jumping over their enemies while they were weak!
Check "The Protagnist's Sister Is Actually the Strongest"!