My guess is that the driveshaft snapped near the back of the transmission the dug into the ground (but stayed attached to the rear end until it tore off of the rear suspension). I'm guessing the guy wasn't running a hoop on his driveshaft.
Definitely lost the front u-joint causing that. For that car to run a chute, it indicates a higher speed car. With the higher speeds come extra rules. One of those rules being a driveshaft hoop to prevent a total loss like that. No way should the car gotten through tech without the hoop.