A bull bucks a man to the ground during a rodeo.
A bull is walking in the desert.
A bull cannot be bucking a man and walking simultaneously.
exists e1 x1 x2 x3 x4.(n_ground(x3) & during(e1,x4) & n_rodeo(x4) & Theme(e1,x2) & Actor(e1,x1) & v_buck(e1) & to(x2,x3) & n_man(x2) & n_bull(x1))
exists e1 x1 x2.(n_desert(x2) & in(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_bull(x1))