I am not sure I follow the question.
Stepping on the scroll has nothing to do with the blue door. To open the blue door you need only to have cleared all the required rooms on the level. If it's closed then you must not have done this.
To step on the scroll, just follow the hints in the relevant room's thread
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×You need clear the room to drop the green door and then re-enter to get to the scroll. If I remember right, it just requires some mimic manipulation on the rafts
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