Rock sunk into his own shadow and soon, there was nothing of him as he bolted to the nearest shadow and waited patiently. Being made of shadows had many advantages, like you weren't limited to your size; his body is only a manifestation. His true form wasn't always material, it was a choice to do so. Once one of their cars would pass by, he would 'jump' from where he was now to the car and attached himself under it, still as a shadow. If he had the choice to be whatever he wanted, he wouldn't have changed for a million dollars After all these years, he had plenty of practice yo control his abilities and such.