Celeste isn’t out of the story yet, as seen by her surprise showing in The Schism of Fire and Water (x) at the end as the person that was pulling Ilyana’s strings. Sam’s ability is starting to evolve more fitting to the story, and he has the ability to know when he’s been spotted or is being tracked. It’s a tingling on the back of his neck, a solid hammer of uneasiness that can come out of nowhere the second he’s spotted. The visions are going to taper off for him slowly.
As for the rest of the story… you’ll just have to wait and see… 😉