>>715673606"The girl must shatter the cage"
Implies Kris must die and that Susie must be the one to do it.
Susie would hate it enough to shatter the glass because killing Kris is the last thing she would do. Also explains why she's moody after the church and just wants to go back to his home with him, and doubles back to the house after leaving, because she can't stop worrying about Kris and doesn't want him to be alone.
Addresses Susie outright saying Ralsei wouldn't let it happen, because Ralsei has been fixated on Susie specifically being less violent ever since chapter 1, and would want to be the one taking the bullet for Kris.
Opens up the possibility of technically fulfilling the prophecy in a benevolent way by eliminating Kris' need to fill the role of the cage via doing something with us, and could be related to "Love finds its way to the girl."
This is the only possibility I can think of that answers every question related to both Susie and Ralsei's reactions to the prophecy, as well as Kris' reactions to things like Spamton Neo and "You were used up."