It's possible that the wall eyes are mentioned for the first time in a while this chapter to lead up to someone fusing with Yasuho to save her life. It could be Tsurugi, if he can just break away from his parents long enough. Of course it could also be Joshu, but I'd have really mixed feelings about that since Yasuho is one of my favorite characters and Joshu is pretty easily my least favorite. Araki seems to be breaking a lot of his old writing standbys in this part so it wouldn't surprise me if he decided to create a new character out of two dying characters rather than just killing them off this time around. Either way, this is the first time this part has had me so far on the edge of my seat, can't wait to see what happens.