South China Morning Post   48 Hours   2015-07-30   In one comical scene in Yasmina Reza’s award-winning Le Dieu du Carnage ( God of Carnage in English), a mobile phone is dropped into a vase of tulips for dramatic effect. It’s a deviant act that Sandra Ng Kwan-yu knows all too well. The popular screen actress did something similar to her film director partner Peter Chan Ho-sun’s device. “I dumped