A man is firing a handgun.
A man holds a gun.
You must be holding a gun to fire a handgun.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_fire(e1) & n_handgun(x2) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_gun(x2) & n_man(x1))