Two men on horseback watch as another man is thrown from his bucking horse.
A man is in a rodeo competition.
Two men on horseback are not assumed to be in a rodeo competition.
exists e1 e2 x1 x2 x3 x4 x5.(from(e1,x5) & n_horse(x5) & Actor(e2,x5) & v_buck(e2) & of(x5,x2) & n_male(x2) & Theme(e1,x1) & v_throw(e1) & as(x1,x4) & n_man(x4) & -(x4 = x1) & n_man(x1) & n_man(x1) & on(x1,x2) & n_watch(x2) & of(x2,x3) & n_horseback(x3) & card_eq_2(x1))
exists p1 x1.(exists x2 x3.(in(x1,x2) & n_competition(x2) & of(x2,x3) & n_rodeo(x3)) & n_man(x1))