People are standing around watching for something.
Nobody is standing.
People and nobody are different.
exists e2 e1 x1 x2.(around(e1,e2) & for(e2,x2) & n_thing(x2) & Actor(e2,x1) & v_watch(e2) & Actor(e1,x1) & v_stand(e1) & n_people(x1))
-exists e1 x1.(Actor(e1,x1) & v_stand(e1) & n_person(x1))