Khatarnak Bikers: Part 1 - S1.E1205

Sheena pays a visit to the racing track and is terrified to see Gulando's racing skills. She storms off, when he doesn't pay heed to her advice of slowing down. She then encounters a racer on her way, who chases her with a gun, and falls down, when she tries to defend herself. What is the reason behind this mysterious attack?