V got caught in the exact same situation she was in Azure city. Invisible, able to escape and feeling unable to do anything to save someone. This time around she decided to stick around.
I didn't see that parallel until just now. V has come full circle, since his feelings of helplessness in Azure City led her to down the path that led him exactly here.
I just realized that the "Second Chance" in the title is V's second chance, not necessarily O-Chul's.
(However - I'm not sure how Xykon would have missed seeing three potion bottles floating from the body of the hobgoblin cleric to O-Chul's. Dramatic license, I guess.)