The skateboarder is turning around while holding onto the ground.
A man is skateboarding.
You can't assume the skateboarder is a man.
exists e2 e1 s1 x1 x2.(n_ground(x2) & n_skateboarder(x1) & while(e1,e2) & onto(e2,x2) & Actor(e2,x1) & v_hold(e2) & a_around(s1) & Manner(e1,s1) & Actor(e1,x1) & v_turn(e1))
exists e1 x1.(Actor(e1,x1) & v_skateboard(e1) & n_man(x1))