'they accuse me... they circle me. They accuse me of being dark in their free city'
'they accuse me ' - repeated - she is too blame
'circle me' - predatorial
'dark' - contrasts the positive sunlight imagery from before
'their free city' - the tyrants feel they are right - contrasts 'the city of walls'
'they' - repeated in the final stanza a lot, unclear who 'they' is, threatening