"What the hell is he talking about?"
After hearing "Nathan's" declaration, Nathan—who had already left before the Sky Clipper ignited—couldn't help but click his tongue in annoyance, slightly regretting not having followed the "future" more strictly.
In the future he had seen, such a situation had never occurred.
[Gate of the Other World] was not about forcibly replicating a specific future, but merely providing a brief opportunity to observe it. Just like a person singing the same song twice, you couldn't expect every note to remain unchanged. It could only guarantee that the information obtained from the future was the same, but could not ensure the future would unfold exactly as seen. Even a slight deviation in action could lead to different outcomes.
*Oh well, if there are differences, then let there be differences.*