A room full of people facing a stage.
A room full of people facing something.
If they are facing a stage, they are facing something - it is just less specific.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & of(s1,x3) & Theme(e1,x5) & Actor(e1,x4) & v_face(e1) & n_stage(x5) & (x3 = x4) & n_people(x3) & Theme(s1,x2) & a_full(s1) & (x1 = x2) & n_room(x1))
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & of(s1,x3) & Theme(e1,x5) & Actor(e1,x4) & v_face(e1) & n_thing(x5) & (x3 = x4) & n_people(x3) & Theme(s1,x2) & a_full(s1) & (x1 = x2) & n_room(x1))