You fight for your balance on the hood of each passing car, but once you begin to lose it, it is impossible to get it back. You topple over onto the street after a speeding taxi slipsfrom under your feet, and the last thing you see before going unconscious, is a van heading in your direction too fast to stop.
But don't worry, you're a vampire. You'll be alright once you heal. Catching Chad, however, is a lost cause at this point. Try again some other time.