So Logna describes how they, along with the other gods or god-like beings, hit some sort of barrier when they reached the dimension where they are. I was thinking about possible reasons that that would have happened, because the implication is that they traveled fairly far upstream but somehow weren't able to travel farther. Maybe there are ways to bend the rules about upstream travel, but only to a certain degree. This would be a reason why they had to stop and didn't go further at the time. Any thoughts on the logic and rules of that?