People walking down a walkway in a city with restaurants along the walkway.
People are riding an escalator in a mall.
They cannot be riding if they are walking.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & with(e1,x5) & along(x5,x3) & n_walkway(x3) & n_walkway(x3) & n_restaurant(x5) & in(e1,x4) & n_city(x4) & a_down(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_people(x1))
exists e1 x1 x2 x3.(in(e1,x3) & n_mall(x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_escalator(x2) & n_people(x1))