BlueSG driver tried exiting the carpark but was unable to. Driver decided to reverse out of the way to let me go ahead instead. I knew in my gut that he'll tailgate me out and true enough, he did. I didn't just accelerate straight out of the gantry as it'd be too dangerous with a curved road ahead. Slowed down and stopped after going past the gantry and stared hard at the driver via my rear view mirror and that's when he backed down.