They walked back along the original path, the fog gradually dissipated, and the indistinguishable sounds when they came became clearer and clearer. It was laughter or quarrels. It was them and other people, a long time ago and a long time later, but they were all familiar. They were listening to them in a very distant place, and they were also listening to them.
That's all good.
Concept: They have walked together and traveled so far, but they have always been in different times - but that doesn't matter.