Why can't any explanation be made? After thinking hard for a long time, I finally understood the reason: because the perspective was wrong.
The following is the conclusion. Maybe some people have posted it too, maybe some people dismissed it after seeing it and said that I didn't understand it and just perfunctory. However, this is the essence of the SG story, and understanding this is considered (in my opinion) to truly understand the SG story.
We look at the world from the perspective of fierceness, and determine that fierceness is the "god" of this world. The so-called world line did not exist before the fiendish (we as the audience) observed it, and the fiendishness must be the current fiendish. Only by looking at SG's story from the current fierce perspective, this story is meaningful. Trying to understand the story of Stone Gate from the perspective of God beyond all the characters in the story, or from the perspective of other characters, even from the perspective of the fierceness a few years ago or the fierceness of a few years later, will encounter various contradictions. Because SG's story is the current fierce story, and SG's world is the fierce world now.
That's the conclusion. In most cases, we are from the perspective of God when interpreting the story, which is no wonder, because the animation gives people the feeling of God's perspective. But everyone who has played the game knows that this story is actually the first point of view of the "current fierceness". If there is a contradiction in a certain place, it is either because you think about the problem from the perspective of God, or you are thinking about the problem from the perspective of another point in time—for example, from the perspective of the future. Again, apart from the things that the current murderer sees, other things are really meaningless. Don't think about what the world lines are like, what you see through fierce eyes is everything. The other world lines are dashed lines, and only the world line you are currently seeing is a solid line.
This explanation may not be "perfect", but I think this is the story. To give the simplest example, sending a d-mail, jumped to another world line. We all recognize this "jumping" process, because we naturally accept the concept of "the observation subject is fierce".
The picture above is a screenshot explaining the world line in the game. According to the world line theory, the world line should be continuous. Even if it will "split/entangle", at least there is no word in the game that a certain world line will break. This matter of sending d-mail to jump to another world line by Yuzhen on one world line. We all think this thing is very natural and there is no problem. However, "no problem" is just speaking from a fierce perspective. Assuming that from the perspective of God, we can see the direction of all world lines. But we who are omniscient and omnipotent cannot answer one question: what happened to the original (before the jump) world line?
We will not be able to think about this problem clearly just because we stand in the perspective of God, because "jumping" itself is a description of the first perspective. From the perspective of fierceness, moving to another is certain, but from the perspective of God, can it be said that there is no fierceness in the original world line? If it exists, how will it develop afterwards? This is something we cannot answer. No clues are given in the game to enable us to see the problem clearly from the perspective of God, because it is unnecessary and meaningless.
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