Several people ride down an escalator.
Several people ride down a long escalator.
Just because several people ride down an escalator does not mean it is a long escalator.
exists e1 s1 s2 x1 x2.(a_down(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_escalator(x2) & n_people(x1) & a_several(s1) & Theme(s1,x1))
exists e1 s1 s2 x1 x2.(down(e1,x2) & n_escalator(x2) & a_long(s2) & Theme(s2,x2) & Actor(e1,x1) & v_ride(e1) & n_people(x1) & a_several(s1) & Theme(s1,x1))