A man in a baseball cap does a skateboard jump on a half pipe.
A man is in a skateboarding competition.
You can not infer it's a competition.
exists e1 x1 x2 x3 x4 x5 x6 x7.(Theme(e1,x4) & Actor(e1,x1) & v_do(e1) & on(x4,x6) & n_pipe(x6) & of(x6,x7) & n_half(x7) & n_jump(x4) & of(x4,x5) & n_skateboard(x5) & in(x1,x2) & n_cap(x2) & of(x2,x3) & n_baseball(x3) & n_man(x1))
exists p1 x1.(exists s1 x2.(in(x1,x2) & n_competition(x2) & a_skateboarding(s1) & Theme(s1,x2)) & n_man(x1))