I have a small theory that this part of Anima and the two fighters is not a memory of what happened in the past, but rather a premonition that was planted in Calypso's head at some point, and that this scene happens as a form of foreshadowing of the possible final battle or of some battle that will happen in the future.Try to replay the story tale about Anima and the two fighters.... Orion is more connected to the story than you think...