What happens next in this paragraph?

People skateboard on a road where cars are passing. One person staggers and falls from the skateboard, and only the road and the sky can be seen. then
(I) , the skateboarder flexes, and then he continues gliding downhill.. (II) gobble are to walk.. (III) , the person continues skateboarding and falls again on the road.. (IV) , the kid get up his skateboard where he is holding a white lever..
(III)