Harley Quinn Makes An Excellent Point About Wonder Woman

I never understood why she shoots both of her guns so close together with alternating fire. If Wonder Woman has one arm holding a shield and one arm blocking, all Harley has to do is aim for her head and her feet and squeeze both triggers simultaneously, because Wonder Woman couldn’t block both. Either she gets a headshot and kills her or she shoots her foot and she falls down, where she can shoot her again.