The bulls are chasing the runners.
animals chasing some people
Bulls are animals, and runners are people. The bulls are chancing them.
exists e1 x1 x2.(n_runner(x2) & n_bull(x1) & Theme(e1,x2) & Actor(e1,x1) & v_chase(e1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_chase(e1) & n_people(x3) & (x1 = x2) & n_animal(x1))