You are a skateboarder. Tonight you have a formidable opponent. The race begins. In a turn your opponent sticks to your skate board and pushes you onto a rock wall. He holds you by the throat and pins you against the rock. Because of the speed, the clothes on your back are torn and your skin is also damaged. Your opponent lets go of you and you fall, sliding further down the track. You try to get up and a skateboarder you don't know stops you from getting up "Don't move !"