People are standing on a street corner pointing.
People on a street corner point out which way the thief ran to a police officer.
People are on a street corner pointing but they aren't necessarily pointing out which way a thief ran to a police officer.
exists e2 e1 x1 x2 x3 x4.(on(e1,x2) & Actor(e2,x4) & v_point(e2) & (x2 = x4) & n_corner(x2) & of(x2,x3) & n_street(x3) & Actor(e1,x1) & v_stand(e1) & n_people(x1))
exists e1 x1 x2 x3 x4 x5 x6 x7 x8.(a_topic(x1) & on(x1,x6) & out(e1,x6) & n_point(x6) & of(x6,x8) & n_corner(x8) & of(x6,x7) & n_street(x7) & to(e1,x4) & n_officer(x4) & of(x4,x5) & n_police(x5) & Actor(e1,x2) & v_run(e1) & n_thief(x3) & (x2 = x3) & n_way(x2) & n_people(x1))