Nana, who didn't care for fighting, had moved away from the scuffle, and was waiting for it to subside- her weilder wasn't there, so she didn't act.
"Shit, that guys an Ancient Elf, be careful." Megohime warned Masamune, lightening dancing along her blade.
More memories came flooding back to Kojurou when he fell to his knees: all the nights he was woken by his wife screaming in her sleep, the nights she couldn't find sleep but only sadness, weeping until exhausted or morning came, mourning her lost children, the guilt she carried for not being able to save them. When for the first few years, she was unable to be intamate with Kojurou unless he was on bottom, for him being on top of her caused her too much mental anguish.
The thought that this man could be holding Jin, defiling her again, and stealing away her children before they even got to feed from her breast, it fueled his rage.