Nice edit, Fea. I think it does reflect Azarmano better, and also shows a nice note of humility on Inzi's part.
As for Himaran's suggestion, I recall a mini-rp that ran in Gondor a couple years ago where Rimbaud and Estelyn blocked an invasion of Minas Tirith which would have entered through the sewers (The Saving of the Star, I believe?). It seems as though if it could be plausible in Minas Tirith it could be plausible in Armenelos. Both are examples of Numenorean city-planning.
However there are a few thing that would need to be incorporated:
1. They would need a credible source to guide them into and/or through the sewers
2. I doubt (highly) the sewers would be unguarded.
Sophia