A man is firing a handgun.
a man fires a handgun at a target
A target doesn't have to be present.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_fire(e1) & n_handgun(x2) & n_man(x1))
exists e1 x1 x2 x3.(at(e1,x3) & n_target(x3) & Theme(e1,x2) & Actor(e1,x1) & v_fire(e1) & n_handgun(x2) & n_man(x1))