A firefighter is standing in his uniform holding a hose.
A fireman fights a fire.
You can be a firefighter and not be a fireman. Just because a firefighter is holding a hose does not mean he/she fights a fire.
exists e1 e2 x1 x2 x3.(for(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_hold(e2) & n_hose(x3) & in(e1,x2) & n_uniform(x2) & of(x2,x1) & n_male(x1) & Actor(e1,x1) & v_stand(e1) & n_firefighter(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_fight(e1) & n_fire(x2) & n_fireman(x1))