Time for a new diff.
An F-body blowing up a diff nothing new here. It looks like his driveshaft broke and catapulted his pinon gear right out of the car. This is why racetracks want you to have a driveshaft loop so if this happens it doesn’t come through the floor. The car looked like it was about to leave really hard and most likely pull the wheels. You also have to give him credit for pulling right over and out of the grove so he didn’t ruin the track for other drivers.