Two dogs fight or play in a field.
Two dogs are playing with a ball in the field.
Just because the two dogs are playing doesn't mean they are playing with a ball.
(exists x1 x2.(a_topic(x1) & n_fight(x1) & of(x1,x2) & n_dog(x2) & card_eq_2(x1)) | exists x3 x4.(a_topic(x3) & in(x3,x4) & n_field(x4) & n_play(x3)))
exists e1 x1 x2 x3.(n_field(x3) & with(e1,x2) & in(x2,x3) & n_ball(x2) & Actor(e1,x1) & v_play(e1) & n_dog(x1) & card_eq_2(x1))