People are running from a fire.
People are running from a fire that was started by an arsonist.
People are running from a fire does not mean that it was started by an arsonist.
exists e1 x1 x2.(from(e1,x2) & n_fire(x2) & Actor(e1,x1) & v_run(e1) & n_people(x1))
exists e1 e2 x1 x2 x3 x4.(from(e1,x2) & Actor(e2,x4) & n_arsonist(x4) & Theme(e2,x3) & v_start(e2) & (x2 = x3) & n_fire(x2) & Actor(e1,x1) & v_run(e1) & n_people(x1))