Safnia took a liking to the then young soul, gifting him something that could only be truly helpful if he was sincere. The ability to tweak fate to his favored outcome, only if it meant he had to die in someone else's place.
Though her gift was initially but a blessing, she has to admit that she has grown fond of the mortal that life after life places others before him. Even now that he remembers all the pain of the deaths before, he still throws himself into the fight. She can feel it, his determined prayer to take the brunt of the hit, to extend others lives just a bit more.

Initially it was simply to satiate her curiosity, however after the death of Bethioras, she watched him with a personal attentiveness. Like her brother-in-law, Centrie would extend other's lifes even if it meant the destruction of his own. She was sure Bethioras would have done that too, given the chance, saved Regizea over and over.
Centrie may never know - like an unknowing pet being taken care of by somethign they simply can't fully percieve. He may never know, just what a personal chord he strikes with the mighty deity.