A man is riding a horse in an event.
A man stealing a horse during a race.
Riding does not imply stealing and not all events are a race.
exists e1 x1 x2 x3.(in(e1,x3) & n_event(x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_horse(x2) & n_man(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & during(e1,x4) & n_race(x4) & Theme(e1,x3) & Actor(e1,x2) & v_steal(e1) & n_horse(x3) & (x1 = x2) & n_man(x1))