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

https://paxtonxokz032.theglensecret.com/how-to-visit-platform-nine-3-4-at-king-s-cross-photos-shop-and-hidden-details

Cross Blackfriars Bridge at twilight and imagine Dementors drifting above the Thames, as town lights flicker like lumos within the fog.