Two women are on a rock wall while others walk along a path.
Two women sit on a wall, watching walkers on a path
It is possible to do more than sit on a rock.  It cannot be assumed that they are watching the people walk by.
exists p1 p2 x1.(exists e1 x4 x5.(along(e1,x5) & n_path(x5) & Actor(e1,x4) & v_walk(e1) & -(x4 = x1) & n_person(x4)) & n_person(x1) & while(p1,p2) & exists x2 x3.(on(x1,x2) & n_wall(x2) & of(x2,x3) & n_rock(x3)) & n_woman(x1) & card_eq_2(x1))
exists e1 e2 x1 x2 x3 x4.(for(e1,e2) & on(e2,x4) & n_path(x4) & Theme(e2,x3) & Actor(e2,x1) & v_watch(e2) & n_walker(x3) & on(e1,x2) & n_wall(x2) & Actor(e1,x1) & v_sit(e1) & n_woman(x1) & card_eq_2(x1))