My idea of a stun device is a 230 grain Gold Dot at about 850fps.
You better get used to the fact that we have long passed the "stun" stage.
I'll bet Zimmerman was thinking the same thing. Which do you think he wishes he had used now?
Don't get me wrong, if any had shown evidence of a weapon or intent to kill (unless the biting was canabalism, I don't think it counts) -- I'm fully in favor of a kinetic solution to the problem, but I don't think that meets the criteria here. Anyway, I like to have ..... options.