Chow Tsz-lok had been planning a trip to Japan with his secondary school friends just hours before he fell from a Tseung Kwan O car park over the weekend, his friends have told the Post.Chow, a second year computer science student at the Hong Kong University of Science and Technology, is now fighting for his life in an unconscious state after falling from the third floor to the second of a car park that was surrounded by riot police and protesters at around 1am on Monday.Police are still…