By letting out all the stops,
jostling them up and down
the scale of his bitterness
This is the elevator man’s way of “getting back” at his former classmates. Understandably, feelings of jealousy run through him. In order to get some sort of “revenge” almost, he jostles the people in the elevator, taking advantage of the power he has over them in that certain instance in time.
“Letting out all the stops” and “scale of his bitterness” play on the idea of the elevator as organ.
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