Man doing a skateboard trick.
man doing a skateboard
"Man doing a skateboard" is just rephrasing "man doing a skateboard trick".
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & n_trick(x3) & of(x3,x4) & n_skateboard(x4) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & n_skateboard(x3) & (x1 = x2) & n_man(x1))