How does Ursa view Vardøhaus castle in the novel, The Mercies?

Vardøhaus, the large castle and fortress at the outskirts of Vardø, is where Lensmann Cunningham, his wife, and their servants move in when they arrive in Vardø. It also houses a jail, where many Sámi and eventually accused witches in Vardø are imprisoned and tried for witchcraft. While an impressive and imposing fortress, Ursa quickly comes to see the entire place as a prison, swallowing people spreading terror.