Did the event not have insurance?? He shouldn't have to be paying for medical bills. I'd imagine the event has some sort of coverage considering all the people standing in front of the car's way picking up cones, cleaning, spectating, and taking pictures. That's a HUGE liability considering all the crazy things that could happen.
I hope all goes well for Matt, I really do.
Drift Fury and its organizers are protected because they make everyone sign wavers.