People outside in a city field.
People waking in a field
Just because people are outside in a field does not mean they are waking (walking).
exists x1 x2 x3 x4.(a_topic(x1) & in(x2,x3) & n_field(x3) & of(x3,x4) & n_city(x4) & outside(x1,x2) & n_thing(x2) & n_people(x1))
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_field(x3) & Actor(e1,x2) & v_wake(e1) & (x1 = x2) & n_people(x1))