Perhaps I should have been clearer about the ropes that Nimue lowered down so that Charles and the others could climb up. Nimue and Goiania had the ropes wound about their bodies when they climbed the walls. They did not use the ropes because there was no way of throwing the ropes up to the top of the towers without alerting the guards standing there. It was only after they got to the top and they had killed the guards that they could let down the ropes for the others.
Sorry for any confusion. I'll see what I can do to clarify things and repost.