Thanks for sharing the pictures with us. Usually, I'm not into "accident pictures" but as your friend got away alive, I think looking at these pictures reminds us all of what could happen with our fast cars.
I wonder why the tire blew? I have my own ideas why but I don't know your friend and I don't want to speculate.
Only a few thoughts: if he track raced this car with the same tires, I'm not surprised at all to see that happen.
I also wonder how fast his car was going, I bet he never thought his OEM tires aren't approved for 300 kph.

As I said, just a few thoughts...tires are the most important (and sensitive) part of a car.
Thanks god he's alive, forget about the car.