OK. Go with me here. (Edited from the future: … even though it appears to lead nowhere. 
)
Port is sensing people. Could be all in one place, could be in different places.
If in different places (and that’s an important assumption), there’s a pretty solid argument—thanks @Ashburn!—that they relate to the solution from Fragment Twelve/Third Assessment, which gave us four cities: Paris, St. Petersburg, Mexico City, and Montréal.
In turn, those four cities gave us a “Future Work” section, a Chronocompass, and a set of Roman numerals.
Those Roman numerals, taken all together, gave us the “two worlds rebound” riddle.
And in particular, the set of Roman numerals our attention is being drawn back to (1324-1654) gives us the word “rebound,” based on @Deyavi’s counting here. Or perhaps “reboundi” since there are eight numbers.
But @Eaves needs a place, not a word. So maybe “rebound” is no help, but the four cities are. Right now, that’s my best guess for the answer for Port.