Let's run a different scenario by the people who think the guy was clearly a genius level constitutional scholar exercising happy go lucky water fight mentality on witless cops.
What if the guy, noticing the cops had guns drawn on him, instead of taking a shooting stance after playing around with what apparently appeared and sounded like a small handgun, simply dropped his water delivery device down where the cops could find it then took some time to explain what the hell it was? Would he still be alive? Would the cops even have arrested him?
My bet is, if he had acted like any normal human being with more than two working brain cells he'd be alive and telling the story to his family while acting it out on the very same porch...
And STY, if you were surrounded by regular citizens holding their constitutionally protected weapons ready to fire who thought they were protecting their families, would you take a shooting stance with this same device in your hands? If they shot you, because they believed they were protecting their (or your) family would you still be writing this?
Cops aren't superhuman. And this "gentleman" was quite clearly a nominee for the Darwin Award.