Cross Blackfriars Bridge at twilight and assume Dementors drifting above the Thames

https://paxtonvhve163.theglensecret.com/how-to-take-the-perfect-platform-9-3-4-photo-at-king-s-cross-london

Cross Blackfriars Bridge at twilight and suppose Dementors drifting above the Thames, as metropolis lights flicker like lumos in the fog.