A group of people are going down an escalator.
People are going down a third floor escalator.
The escalator isn't necessarily on the third floor.
exists e1 s1 x1 x2 x3.(a_down(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x1) & v_go(e1) & n_escalator(x3) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 s1 s2 x1 x2 x3.(a_down(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_go(e1) & n_escalator(x2) & of(x2,x3) & n_floor(x3) & a_third(s1) & Theme(s1,x2) & n_people(x1))