[ Vanitas doesn't, really, care what happens to this guy. In fact, if he let it go and let it dismember him it'd certainly give Vanitas more than enough time to get away. What it is, exactly, that drives him to stay and keep fighting is hard to say. Nothing altruistic. He doesn't know this man, and even if he did, the odds were 50-50 that Vanitas still wouldn't just leave him to his fate.
So he doesn't bother trying to step in to prevent the man from getting injured. If he could use a sword like that, he should be more than aware of how to fight properly. Vanitas, instead, raises his open palm higher and curls it into a fist. More shadow spools up from the ground like a living thing, wrapping up the spirit's limbs and reaching for it's midsection like great pythons. ]
HHH SO LATE SORRY
So he doesn't bother trying to step in to prevent the man from getting injured. If he could use a sword like that, he should be more than aware of how to fight properly. Vanitas, instead, raises his open palm higher and curls it into a fist. More shadow spools up from the ground like a living thing, wrapping up the spirit's limbs and reaching for it's midsection like great pythons. ]