A man is looking down.
A man stares at the ground.
Stares is a form of looking.  The ground is located down.
exists e1 s1 x1.(a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_look(e1) & n_man(x1))
exists e1 x1 x2.(n_ground(x2) & at(e1,x2) & Actor(e1,x1) & v_stare(e1) & n_man(x1))