One choice could change everything.
Cressa-la went into the water of her own volition to save the dolphin... but what if she stayed ashore? A small change in a series of big events may seem insignificant, but it's the tiny differences that could change the outcome of specific things, such as, say, the end of the world.
Can Cressa-la save it this time, not knowing about what lies beneath the water's surface, not knowing of the evil force on her tail, or will the earth crumble at the hands of darkness, everything saturated in green illumination?
Perhaps.