he hit the jump and got about 20 feet of air before landing. >> next it's shanna's turn. >> go, shannan i started going down the hill, i wanted to stay on top of the tube. i thought as long as i would have it underneath me i would be okay. as soon as i hit the jump, i started leaning back too far. i knew i was going to have a problem. >> shanna loses control of her position and falls on her neck with the rest of her body following right behind. >> when i hit the ground, my upper thighs actually connected with my shoulders when i felt this big smack of my entire body collapsing in on itself. it was really painful. >> the impact is tremendous. shanna lies motionless on the ground terrified she may be seriously injured. >> i was fairly immobile. i could move my limbs but couldn't sit up. the pain only got worse. i knew i wasn't getting better. i realized i was going to need help. >> shanna's friends call an ambulance and she's immediately taken to the hospital. >> i was concerned that if anybody were to move me or pick me up that i could have a spinal cord injury. >> at the hospital shann