A bucking horse is throwing a man off his back at a rodeo.
A passive horse allow the man to sit on itself.
Bucking horses are not passive, and sitting on a horse is different than being thrown off the horse's back.
exists e1 x1 x2 x3 x4 x5.(at(e1,x5) & n_rodeo(x5) & off(e1,x4) & n_back(x4) & of(x4,x1) & n_male(x1) & Theme(e1,x3) & Actor(e1,x1) & v_throw(e1) & n_man(x3) & n_horse(x1) & of(x1,x2) & n_bucking(x2))
exists e1 p1 s1 x1 x2.(n_thing(x2) & n_man(x2) & Topic(e1,p1) & Recipient(e1,x2) & Actor(e1,x1) & v_allow(e1) & exists e2.(on(e2,x2) & Actor(e2,x2) & v_sit(e2)) & n_horse(x1) & a_passive(s1) & Theme(s1,x1))