Three timelines all separate at the same point of Circo sacrificing himself to save Ridill from being killed in the coda:
Revival-- Circo is brought back like willow, but handles it so much worse due to so many reasons, primarily that Circo joined flow to die protecting someone as his "perfect ending" (closure) for his trauma, and being brought back confronts him with the consequences of his actions and removes the closure he got from it.
Coma-- Circo survives the incident but barely, is in a coma for many months where he has a whole character arc in his head, and awakens with a will to live and hope for the future.
Reflection/Terminus-- (the most canon) Circo becomes a reflection called the mask of the fallen martyr when he dies, the mask holds fragments of Circo's memories-- but is not Circo, more so a new being haunted by his ghost without really knowing who Circo is and what they are themselves.