Chapter 8: OCC
Well Vanyra could do that within a given neighbourhood, but not across the whole city. Ossylia is a Kingdom of 210 million people, given or take, and the capital of Ossylia has millions of people in it. It would be like somewhat similar to Vancouver, spread out across a large harbor area ringed with mountains, but the mountains would not be as high as Vancouver.
As for ways out of the city, within a couple of days all the gates to the city are re-opened, and the harbor is back to about 66% of typical operations. A new government force, the Ossylian Royal Foreign Trade Corps, has assumed control of all foreign port areas. They are tasked with controlling immigration and importation of goods, and assist treasury officials in the collection of duties and taxes on imports. It's too early to get a sense of how they operate, but from first impressions they appear a much more militaristic organization than the previous mix of agencies controlling such areas.