Well, fuck. I knew Shouko was looking to good to be true; now author's probably gonna cull her too.
That said, I suspect the ending of the story weighs really heavily on Shouko and how Sato reacts to this. Shouko's emotions/motived towards Sato's are probably the most genuine/purest of any other character beyond the feelings between Shio/Sato themselves (it's even possible Shouko's emotions for Sato's exceed Shio's for Sato's in genuineness, if only because IMO the author has left us fairly shrouded regarding Shio's true feelings, so we never really know what Shio's thinking). If Sato can manage to hurt Shouko to protect her secret then she essentially becomes indefensible to me, because there's no line she won't cross. At least everyone else she threatened ostensibly posed a threat themselves, whereas Shouko hasn't expressed anything beyond wanting to help Sato any way she can. If Sato hurts Shouko now it's going to lead us down a path where she keeps pushing that edge as far as she can, giving us some irredeemable, rocks-fall-down ending.
TL;DR DON'T HURT SHOUKO FFS. I WANT THAT HAPPY ENDING.
Sighs.