haha i know how you feel but this was practically her last resort especially now since shinpei went on a killing spree and ruined his image entirely, making it impossible for them to be together without being separated or chased down, along with the fact he wouldnt snap out of his haze no matter what she said or did
What would you do instead then? She is taking the hit because of Shinpei, thats probably the only way to snap him out of his murderous rage. Also people swinging swords is a fast powerful move and it happens fast, hell Shinpei probably can even cut rocks now that he is locked in, there was no other way than someone taking the hit, and, since is Satoko, is going to affect him.
ik this isnt girl power of me but this bih chose the option TO TAKE THE HIT??? for a man she doesnt even likeeeeee like yes abusive dad terminally ill murderous stepmom evil step sister murderous lover she honestly cant catch a break but STAND BEHIND SOMETHING PLEASEEE LMAO finally commits to a decision and it's THIS? LOCK IN