I am with you Vince.
It looked to me like a piece hit the back of John's car just as he pulled the chute.
At that kind of speed there could have been a vortec that pulled that timing block right into the back of John's car causing it to rip apart.
No matter, I too am glad John did not suffer any worse injury than he did.
Still, his season is over and I wish him a complete and speedy recovery.
Our thoughts are with you John!
Here is some info....
http://www.star-telegram.com/sports/story/245389.html