That is not far from where I live. Since Sukhumwit was widened between the Marina and Sattahip, the number of screaming motorbikes all through the day, and more particularly night, has increased exponentially. Some are so distinctive I can tell them apart by the time of night/morning and the evil revving-up annoyance pattern. Night racing has become a local sport.
No doubt these two were indulging their addiction, and richly deserve the consequences.