At the end of "The Long Utopia" by Stephen Baxter and Terry Pratchett:
Lobsang, Sally, and Stan are all "stranded" on the newly-cauterized world that the Silver Beetles are in the process of spinning to its death. They removed it from the chain of the Long Earth (East and West stepping), but they did not remove its connection to the long "Planetarium" (North stepping). It seems that they could have stepped to the bug world and started a whole new adventure in the long planetarium (at least the first step on the bug world had breathable atmosphere). It seems that, if this was a possibility, the Next or Lobsang would have "foreseen" it, and possibly it bears mentioning.
Was all of this an oversight on the part of the authors? Or are there context clues that express why this wouldn't be possible?