People going down an escalator.
People are carrying shopping bags.
People going down an escalator doesn't mean that they must be carrying shopping bags.
exists e1 s1 x1 x2 x3.(a_topic(x1) & a_down(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x2) & v_go(e1) & n_escalator(x3) & (x1 = x2) & n_people(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_carry(e1) & n_bag(x2) & of(x2,x3) & n_shopping(x3) & n_people(x1))