While Mitsuki was dimly aware about what Yukino was doing at the moment, she was a tad more preoccupied with her own fight since it did serve to be a greater draw on her attention. Still, what she was enough to leave her reassured her her companion could handle herself, and might not be the best person to go against directly in a fight. Fortunately the Hero Brigade and the Order had never had a serious battle, and whether she could do that to another human was a far different story. 

For the moment though her fight went on unabated. She leapt and dived, quick on her heels as she moved forward and the Primordial fell back, pelting her with swords which she deflected or simply avoided. their blades met and separated, sending sparks across the field of battle as the sound of their collision echoed in the void that only they could hear. 

"Come on, is that all you have," she spat at the Primordial, hurling her own daggers at the black being as it let out a guttural yet mocking laugh and sprang away. New ones immediately formed in her hands to be thrown or used as she followed, tracking her target. It was all she could do to keep civilians from being drawn into the mix and making this situation even worse than it was already, but she did her best. 

Then Yukino acted, calling out to her as her surprise unfolded. Mitsuki's eyes widened before she nodded in determination, acting in accordance with the plan. Daggers flew through the air, rapidly followed by her in turn to meet the Primordial when it dodged the projectiles. A few brief clashes as they fought for the initiative before she struck, using her powers to cause the Primordial to misjudge a block so she could land a hit. That elicited a cry of pain and anger from the caped being in protest, which she ignored as she broke away with a kick that would send it stumbling towards Yukino's surprise.

"Game over," she said with a certain smile.