Some people in shadow walk by an escalator.
The people are at the mall.
People walking by escalator doesn't mean they are at the mall.
exists e1 x1 x2 x3 x4.(a_topic(x1) & Actor(e1,x4) & n_escalator(x4) & Theme(e1,x3) & v_walk(e1) & (x1 = x3) & in(x1,x2) & n_shadow(x2) & n_people(x1))
exists p1 x1 x2.(n_mall(x2) & n_people(x1) & at(x1,x2))