i was there and saw the accident, but not the whole thing. there was a car that got upside down going into turn 1 and everyone slowed down to miss him including Michael. Michael then hit the flipping car and instantly accelerated. i didn't get to see the contact but i did see him accelerate toward the fence. playing it over in my mind, it seemed as though something probably hit him in the head off of the flipping car that caused him to lose consciousness because there was no indidcation of the throttle sticking from what my dad said. i didn't get to see the helmet, but i heared that it had damage which again leads me to believe that something hit him. what i am speculating is that he might have been hit by the flipping car's rear bumper causing the helmet damage and facial damage. it's hard to say if the contact with the other car caused the head injury, but most likely it was when he hit the wall. every factor that we considered led to this conclusion...but we might never know for sure.

Note: SPECULATION ONLY...BUT THESE FACTORS SHOULD BE LOOKED AT IN THE FUTURE