A group of people walk in the park, while some talk on phones.
A pack of wild dogs is running through the park, causing a ruckus.
People that walk is not the same thing as wild dogs running.
exists e1 x1 x2 x3 x4 x5 x6.(n_park(x4) & a_topic(x1) & of(x1,x2) & while(e1,x5) & on(x5,x6) & n_phone(x6) & n_talk(x5) & in(e1,x4) & Theme(e1,x3) & v_walk(e1) & (x2 = x3) & n_people(x2) & n_group(x1))
exists e2 e1 s1 x1 x2 x3 x4.(n_park(x3) & for(e1,e2) & Theme(e2,x4) & Actor(e2,x1) & v_cause(e2) & n_ruckus(x4) & through(e1,x3) & Actor(e1,x1) & v_run(e1) & of(x1,x2) & n_dog(x2) & a_wild(s1) & Theme(s1,x2) & n_pack(x1))