I don't think it really matters. Some doors, suck as those near the start of Monsaic Lines where you go on a small obstacle course, are obviously connected with short corridors or tunnels, but some like those in SoulStorm Brewery appear to lead into just a small dome-like nodule, excluding that possibility. I don't see why they need to be explained, at all. In fact, I'd rather like to see such things come back in future games, instead of the aweful teleporters that we in MO.
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