A man on a horse chasing an animal.
The man is an animal wrangler.
a man chasing implies a wrangler
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_chase(e1) & n_animal(x4) & (x2 = x3) & n_horse(x2) & n_man(x1))
exists p1 x1.(n_man(x1) & exists x2 x3.((x1 = x2) & n_wrangler(x2) & of(x2,x3) & n_animal(x3)))