A person walking away from the bottom of an escalator.
The person is leaving.
Walking away from the escalator does not imply the person is leaving.
exists e1 x1 x2 x3 x4.(n_bottom(x3) & a_topic(x1) & from(e1,x3) & of(x3,x4) & n_escalator(x4) & r_away(e1) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_person(x1))
exists e1 x1.(n_person(x1) & Actor(e1,x1) & v_leave(e1))