By Dan Warburton A woman rushed from her block of flats after hearing screaming and helped save a girl, three, as she was “thrown to floor” after a man doused a woman and two children in a corrosive liquid last night. Shannon Christi, 35, needed hospital treatment after she came into contact with the alkaline substance. Police have branded the scenes in Clapham, south London, “horrific” after they left a mum and her two children injured. They were among the eight victims who needed treatment at hospitals on Wednesday evening, and a further person was treated at the scene. Shannon, a bus driver…