out. the care flight helicopter comes along. you know that's about as bad as it can get. >> the care flight helicopter rushes tommy to the closest trauma center. david, the driver who hit him, is uninjured and devastated about his friend. >> he was probably one of the most upset people there. i guess he felt like he might have been the cause of it or whatever. it actually, emotionally, scarred him to the point where he really lost the excitement and didn't want to get back in a race car again. >> the horrible accident leaves spectators in shock and leads to a lot of second guessing and finger pointing among racing pros. >> it would be easy to say one of the drivers might have drove a little bit over his head or something. we didn't see anything unordinary. it could have been part failure. it could have been something got underneath the tire. we really don't know, it happened so quick and so fast that it's hard to say exactly what happened. >> the cause of the crash was never determined. as for tommy, his stay at the hospital in houston is brief. >> luckily it wasn't as bad as it looked. he had bruises all over him and kind of hard for him to get