The silver Nissan was clearly at fault, and the driver knew that so they decided to tray and make an escape. The person they hit quickly follows, and they start weaving through slow moving traffic. That works for only so long until they get held up by a wall of cars, luckily one of them ended top being a police van. The driver must have been so relieved to see this and to make it better the Nissan still tries to get away, so the cop driving witnessed the person fleeing. At that point, it almost doesn’t matter who caused it because the actions of the silver car put them in the wrong.