People in costumes are standing outside.
People are standing outside waiting in line to get into the haunted house.
People standing outside does not imply waiting to get into a haunted house.
exists e1 s1 x1 x2.(a_outside(s1) & Manner(e1,s1) & Actor(e1,x1) & v_stand(e1) & in(x1,x2) & n_costume(x2) & n_people(x1))
exists e2 e1 p1 s1 s2 x1 x2 x3.(n_house(x3) & a_haunted(s2) & Theme(s2,x3) & for(e1,e2) & Topic(e2,p1) & exists e3.(into(e3,x3) & Actor(e3,x1) & v_get(e3)) & in(e2,x2) & n_line(x2) & Actor(e2,x1) & v_wait(e2) & a_outside(s1) & Manner(e1,s1) & Actor(e1,x1) & v_stand(e1) & n_people(x1))