No matter how one tried to break through beyond their limits, there would always be a dead end. That dead-end is inevitable, sort of like a law that governs everyone in their physicality. Even superheroes who seemed to be indestructible and all-powerful have a weakness, be it their loved ones, or a drawn-out fight that would expend all of their energy. Crow knew that perfectly well and that's why the villains he brought with him were all defensive, or at least physically tanky enough that any superhero will have a hard time bringing them down. Their goal wasn't to defeat Splatoon and his team but to deplete their energy in a drawn-out battle.
And it seemed to be working.
Berserk mode let's go!