There's a girl in a black mask and brown or black shirt with her arms spread wide seemingly to make it safe for the drivers to swap. It doesn't appear that anyone else enters the vehicle again. Something happened prior to this video because they are documenting the vehicle for future reference, then the new driver just plows into the people. I am betting that first, at least most the crowd wasn't all aware of the car being there and weren't purposefully blocking it, and secondly the driver plowed in unprovoked either by accident or as a follow up to an earlier issue.