A young man jumps down a flight of stairs on his skateboard
The kid is practicing for a skateboard competition.
Just because a young man is riding a skateboard does not mean there is practicing taking place.
exists e1 s1 s2 x1 x2 x3 x4.(a_down(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_jump(e1) & on(x2,x4) & n_skateboard(x4) & of(x4,x1) & n_male(x1) & of(x2,x3) & n_stair(x3) & n_flight(x2) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(n_kid(x1) & for(e1,x2) & n_competition(x2) & a_skateboard(s1) & Theme(s1,x2) & Actor(e1,x1) & v_practice(e1))