I wonder that too. Was that the driver? The guy in the orange shirt was brave as **** to scramble in and pull the guy out like that. Brave in that the groups grip on the car could slip and also in that as has been said, he could be sued. At a guess, he was gripped by adrenalin and just darted in without thinking through the possible consequences.
Another note, while it is cool to see the video, who filmed that? Who stood there and essentially watched? Overall though, kudos to humanity.