A man in a black coat is riding down the escalator.
The man heads downstairs.
Going down the escalator means going downstairs.
exists e1 s1 s2 x1 x2 x3.(n_escalator(x3) & a_down(s2) & Manner(e1,s2) & Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & in(x1,x2) & n_coat(x2) & a_black(s1) & Theme(s1,x2) & n_man(x1))
exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_head(e1) & n_downstairs(x2))