The black dog is catching a ball, while the white one watches.
A dog being trained to catch a ball.
Just because the dog is catching the ball doesn't mean he is being trained to do so.
exists e1 s1 s2 x1 x2 x3.(n_watch(x3) & card_eq_1(x3) & a_white(s2) & Theme(s2,x3) & n_dog(x1) & a_black(s1) & Theme(s1,x1) & while(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_catch(e1) & n_ball(x2))
exists e1 p1 x1 x2.(a_topic(x1) & Recipient(e1,p1) & Topic(e1,x2) & v_train(e1) & exists e2 x3.(Theme(e2,x3) & Actor(e2,x2) & v_catch(e2) & n_ball(x3)) & (x1 = x2) & n_dog(x1))