I read a comment saying he was just trying to shoot the tires out in order to stop him from running more people over after he drove into the crowd.

Looked like the car was in the intersection then the crowd marches through blocking him. There was some sort of confrontation that we can't see. Perhaps someone hit the man's car or taunted him. This led to a panic situation because he became a target for the mob.

Almost sounds like you can hear a tire squeal and the crowd in that area reacts excitedly. A man yells "everybody get back" and soon after 5 AK-47 shots go off, crowd hits the deck and panics as 3 smaller caliber shots are fired.