I assume that those who are not downstairs know nothing of what is happening. Until Amaryllis learns anything, she and Mouse will continue guarding the crawlways.
You can tear down the curtains and make strips of fabric out of them for rope if you really want to.
Anyone not downstairs could make a listen check to see if they heard the dwarven cry. DC15 if you are on the ground floor. DC23 if you're on the next floor up. Do DM's normally just make the DC's up?
Amaryllis leaves a hair on the entrance to the ground floor crawlway and goes downstairs to respond to Seebor's call. Mouse remains guarding the upstairs crawlway.
After the dwarf is tied up Seebor will (carefully) explore the fourth and then the 5th curtain and then southern room and then the western room - checking for traps as before.