A person falls into the mud while being trampled by a bull.
A person slipped in the mud.
We have no idea if the person slipped, they could have been pushed or a number of things.
exists e2 e1 x1 x2 x3.(n_mud(x2) & while(e1,e2) & Actor(e2,x3) & n_bull(x3) & Theme(e2,x1) & v_trample(e2) & into(e1,x2) & Actor(e1,x1) & v_fall(e1) & n_person(x1))
exists e1 x1 x2.(n_mud(x2) & in(e1,x2) & Actor(e1,x1) & v_slip(e1) & n_person(x1))