A man is skateboarding down a railing on some stairs.
A man is doing a trick on his skateboard.
Your are doing a trick if you are skilled enough to skate down a rail.
exists e1 s1 x1 x2 x3.(a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_skateboard(e1) & on(x2,x3) & n_stair(x3) & n_railing(x2) & n_man(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & on(x2,x3) & n_skateboard(x3) & of(x3,x1) & n_male(x1) & n_trick(x2) & n_man(x1))