A black and white dog is bounding down white steps.
A dog is chasing someone down stairs.
Just because the dog is bounding doesn't mean he's chasing someone.
exists e1 s1 s2 s3 s4 x1 x2.(a_down(s4) & Manner(e1,s4) & Theme(e1,x2) & Actor(e1,x1) & v_bound(e1) & n_step(x2) & a_white(s3) & Theme(s3,x2) & n_dog(x1) & a_white(s2) & Theme(s2,x1) & a_black(s1) & Theme(s1,x1))
exists e2 e1 x1 x2 x3.(Theme(e2,x2) & Actor(e2,x1) & v_chase(e2) & Actor(e1,x3) & v_stair(e1) & (x2 = x3) & r_down(x2) & n_person(x2) & n_dog(x1))