A man is running down a sand covered mountain.
A man racing down a hill after his dog.
A man running down a mountain does not imply that he is racing, or running after his dog. A mountain is not the same as a hill.
exists e2 e1 s1 x1 x2 x3.(a_down(s1) & Manner(e2,s1) & Theme(e2,x2) & Actor(e2,x1) & v_run(e2) & n_mountain(x2) & Theme(e1,x2) & v_cover(e1) & of(x2,x3) & n_sand(x3) & n_man(x1))
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & after(e1,x4) & n_dog(x4) & of(x4,x1) & n_male(x1) & a_down(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x2) & v_race(e1) & n_hill(x3) & (x1 = x2) & n_man(x1))