there was fog as dawn approached , for the summer was drawing to a close and the two rivers which joined at chyrellos fumed grey , wispy tendrils of mist from their dark surfaces in the cool of the night , and the tendrils joined together to form first a haze that softened the orange torchlight , then a mist which enshrouded distant houses and finally that thick , clinging fog so common in cities which are built along rivers .