"You know how balance is, it's like the Ying-Yang concept. If there's light, there has to be darkness. If there's darkness, there has to be light. From what I can remember from my lessons while training, both of those opposites can't live without each other. If one's gone, the other will crumble apart. At least...that's what I can say from the top of my head," Kaika said as she recited a bit of her learnings from her mentor Nero.