The horse and rider are both on the ground at the rodeo.
The rider is on a horse and have fallen.
on the ground indicates that the horse and rider have fallen.
exists p1 s1 x1 x2 x3 x4 x5.(n_rodeo(x4) & n_ground(x5) & n_rider(x3) & n_horse(x2) & subset_of(x3,x1) & subset_of(x2,x1) & at(p1,x4) & a_both(s1) & Manner(p1,s1) & on(x1,x5))
exists e1 p1 x1.(n_rider(x1) & Actor(e1,x1) & v_fall(e1) & exists x2.(on(x1,x2) & n_horse(x2)))