A FILIPINO maid pushed her employer's young son out of the path of a runaway bus in Happy Valley yesterday but she was killed by the vehicle. The bus also knocked down two schoolgirls, who were trapped under the vehicle but were later treated in hospital and discharged. Domestic helper Ms Waling Dasias, 35, was taken to Tang Shiu Kin Hospital but died about three hours later. Her employer's five-year-old son, Ng Ka-ho, received only minor injuries to his mouth when he was pushed out of the way. The incident occurred at about 3.30 pm when the bus driver parked the vehicle in steep Shan Kwong Road and went to chat with other school bus drivers.