People are walking down the stairs through the fog.
Men are walking downstairs.
You cannot infer the people are men.
exists e1 x1 x2 x3.(n_fog(x3) & n_stair(x2) & through(e1,x3) & down(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_downstairs(x2) & n_man(x1))