A man is firing a handgun.
The person had a handgun and was using it.
Using doesn't necessarily mean it was fired.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_fire(e1) & n_handgun(x2) & n_man(x1))
exists e2 e1 x1 x2.(n_person(x1) & Theme(e2,x2) & Actor(e2,x1) & v_use(e2) & n_thing(x2) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_handgun(x2))