I know what I saw. Me cousin was killed by his seatbelt holding him to the impact of that tree. I'll explain to you how it happened:
It was supposed to be a race, but it may have turned into a fight. Whether it did, we will never know. But we know he was murdered. He neared the finish line, and crossed it before the other guy. The other guy, he doesn't like this. So he pushes the back end of me cousin's car, twice. My cousin spun around on the road more than 180 degrees, his back wheels go into the ditch. The front wheels get traction again, spinning the car around. It goes off the other side of the road sideways, and jumps a ditch four feet deep. The wheels catch the rim of the ditch, though, and proceed to start his car into a flip, but first he hits a tree in his driver's side door, his seatbelt catches, holding him to the blow. He wipes out the tree, and proceeds to flip, end over end now, five times, ending up with his front facing the the road, his car turned 180 degrees since it hit the ditch, and on it's wheels. If me cousin had not been wearing a seatbelt, he would have survived. You can't say seatbelts are completely safe.