A bucking brown horse next to a falling cowboy.
A horse flung a cowboy off his back.
The cowboy could be falling for reasons other than having been flung from the horse.
exists e1 e2 s1 x1 x2 x3.(a_topic(x1) & to(x2,x3) & n_cowboy(x3) & Actor(e2,x3) & v_fall(e2) & next(x1,x2) & n_thing(x2) & n_horse(x1) & a_brown(s1) & Theme(s1,x1) & Actor(e1,x1) & v_buck(e1))
exists e1 x1 x2 x3.(off(e1,x3) & n_back(x3) & of(x3,x1) & n_male(x1) & Theme(e1,x2) & Actor(e1,x1) & v_fling(e1) & n_cowboy(x2) & n_horse(x1))