[ he scoffs at the teasing, but falls contemplatively quiet right after. explaining this kind of thing generally fell to the more talkative members of their little light defender squad, even if riku probably understood it better than some of them. or they'd hand the task off to ienzo, always happy to lay out details even if he tended to get carried away with academic terminology.

after a long pause, he fumbles over the beginning of the explanation anyway as they arrive at the burger place. ]

Each world's got... There's different knowledge in them, different origins. Some are really isolated. [ his own home being one of them, though with the occasional comings and goings of the aforementioned light defender squad these days, it's opened up a bit. ] Others are almost like - hubs, I guess, for people from all over.