Considering the title was speaking in past tense... I am afraid we are already too late *goes into a corner and cry*
I managed to remove the shakles while Miko (she was one of this monster's victim.) enacted a revenge that would have make Tojiko proud. As for the knee; it is only a knee. for a human, this kind of wound would be crippling. but for a youkai like Byakuren (a witch if you would prefer.) it's extremely painful, but will mostly heal after a week and completely forgotten after a month.
What had us worry (and the reason why Yukari contacted me on my emergency line.) was the emotional wound, Byakuren's trust in human, even if she claims other-wise is very fragile. once this is broken, Byakuren's sanity would have snapped.
Like Utsuho, she is considered a 'special case' meaning that the use of a 'sue' to deal with her when such an emergency arise is considered 'standard procedure.' Remember, she has absorbed pure miasma for more the a 1000 year, if she break's nothing will be left.
Don't worry though, I managed to hold onto her sanity while her emotion broke free. She will still be in need of councilling, but I know of a few that can and will help her. She is strong, she can and will mend this wound. like any other wound she had.
As for that monster?
After Miko avenged her own beating, it was straight to (my) Shiki Eiki.
Countering bad fanfiction with more bad fanfiction isn't the right thing to do.
You just validate the guy's sadist headtrip by entertaining the possibility of it. The only monster here is the artist for making this. Go give him an earful if you can, vote down his stuff if possible or just ignore him and let his dumb fanfition die in a pit of obscurity.