D uses his hands to toss himself upwards the last few feet. The long coat spreads out and for a moment D looks like a mystic bird before he lands silently on the edge of the ledge.

"To find the source of light. If you're going too, we might as well look at it together." Or D has read this situation wrong and interrupted someone's recreational free climbing time. But the seriousness this man has and his earlier interest in the light at the top makes D think that isn't the case.

There's no telling what kind of strange magic or information the robed man might have from his dimension. D's knowledge is considerable but even in his home he constantly encountered things he'd never seen before. Here he doesn't even have long centuries of experience to rely upon.