Anastasia
Her gambit kind of worked out, but the difference in their might was still self-evident. The woman who aided them was hurled back by his blow. Well, she might have been killed by that blow, but Anastasia focused on the now rather than the fate of someone who wanted to settle some score too. She just didn't know that woman any longer than she popped out of her shadow, so she didn't spare a milisecond for mourning her. Instead she focus on the situation at hand. They were back again to the previous situation, with the difference that the man tried to mentally break down Medaka with words. Him calling her out for her selfishness? What a farce.
"You're condemning her for her selfishness, as if you were the selfless one. Don't make me laugh, everyone's selfish in the world on some level, as long as they pick a goal. Medaka's here to fulfill her goal, I chose to stand by her and you even proactively chose to thwart us first." No matter what Medaka decided to do, they had to fight him anyway, so she put emphasis on that last word.
Of course as she began her short speech she already started preparing a spell. If he rushed at her, as long as he didn't kill her outright, she'd probably set off enough energy to blow up without care for collateral damage and making her death not senseless. But if she managed to find right timing, she'd just use the spell in more outward fashion. She already got over the possibility of dying here, and she focused on just doing as much as she could.