I'm not done reading it yet so I'm not sure if it's addressed, but there was a bit that got my attention and got my wondering. I believe there was a part when Jake was in Derry and

IT spoke to him from the Kitchener Ironworks
, and it mentioned that there could be another rabbit hole in the fallen chimney. What would happen if there really was? A rabbit hole within a rabbit hole? Would you have to come back to the time you entered the rabbit hole in and THEN leave through the original rabbit hole?