Cowboy being thrown off bucking horse.
The man is performing at the rodeo.
A cowboy is not always performing and not always at a rodeo.
exists e2 e1 s1 x1 x2.(ne_nam_cowboy(x1) & for(e1,e2) & Theme(e2,x2) & Actor(e2,x1) & v_buck(e2) & n_horse(x2) & a_off(s1) & Manner(e1,s1) & Theme(e1,x1) & v_throw(e1))
exists e1 x1 x2.(n_rodeo(x2) & n_man(x1) & at(e1,x2) & Actor(e1,x1) & v_perform(e1))