This helmeted person is doing a stunt on a bicycle outdoors.
A BMXer does a flip in a competition.
Not all persons are a BMXer.
exists e1 s1 x1 x2 x3 x4.(n_person(x1) & a_helmeted(s1) & Theme(s1,x1) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & on(x2,x3) & n_outdoors(x3) & of(x3,x4) & n_bicycle(x4) & n_stunt(x2))
exists e1 x1 x2 x3.(in(e1,x3) & n_competition(x3) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_flip(x2) & ne_org_bmxer(x1))