If you can reliably hop the turnstyle and ride the subway for free, then managing to place a friend in two separate cars to be on either side of a planned decou

If you can reliably hop the turnstyle and ride the subway for free, then managing to place a friend in two separate cars to be on either side of a planned decoupling doesn't seem like too much of a stretch. It would be even more miraculous if the cell managed to relate interlopers to just one side for the event. Although you're kind of getting away from cell fission at that point: that's more like birth.