We learn more about trading?

Pyrrha flew over to the world smiling at everything she saw, the happy people cheering, the cows eating, and the children playing. She took a deep breathe and thought this was all good. Until she saw a bit of a dead area, the grave yard had less life in it than it usually did. She slowed down and landed in the area, "Apollo," She said pulling out a Cannon, "What ever you're doing stop it." A hooded angel walked out from behind a dead tree, "Sorry about that, I just have that effect." "You!" Pyrrha said aiming the cannon at his head, "Why are you here?! EXPLAIN!" The angel of death walked over to her stating that she woke up on the wrong said this morning, only to get scowl from the angel. "Sorry...Anyways, I'm here because it just feels right.. Grim Reaper just in the graveyard.." Pyrrha put her cannon and looked at the angel. He seemed sad, as if he had something before this. She walked over and put her hand on his shoulder, only to feel empty inside and pain on the outside. He quickly pushed her off, "Don't touch me... That's how this place ended up like this." Pyrrha rubbed her hand and apologized for that, and looked into his eyes, or eye holes at the moment. The Angel looked at her for a moment and started to ask a question, "Have you ever heard the term 'Equivalent Exchange'?" She looked at him confused, "I am not familiar with the term." The Angel sat down and started to talk about it.

"Equivalent Exchange is basically giving two things of equal value for each other. Such as a horse for a cow, a bow for a blade, or a life for power. Most times people are willing to make this trade, such as Dark Pit and trading his sanity for more power, or Apollo for the souls of the living to make Medusa's army larger. But sometimes, they did not even mean to make the trade. It just happens. Like Ruby and your life. Ruby did not want you to die, but it was the trigger to her power." He looked at Pyrrha who had started to cry a bit, "So are you saying I was nothing more than an item of trade?" The angel of death shook his head slightly, "No. It just ended up being that way. You where a loyal woman to the end, and I am glad you took Pit's place." Pyrrha was a bit confused, "How did you?" "I know about every soul that died, every world, every last breath, and every drip of bleed shed. I know about Pit, maybe a bit more than you do." Pyrrha looked at him and shrugged, "Well you are the angel of death." She rubbed her arm a bit, "I'm guessing he was part of the 'Equivalent Exchange' thing? His life for mine?" Death smiled a bit, "Yep... And he was willing to do it." Pyrrha felt a bit better knowing that it was his own choice, rather than by chance, but in a sense, she felt guilty. Just then she got a call from Palutena, "Apollo's setting up a camp near Blood Lake! We have to go." Pyrrha looked up and responded with an 'okay', and gave Death an air hug. He smiled and watched her get pulled out, "Just like the old days Lady Palutena.." He sat back down and took a black rose from the ground, "Exactly like the old days."