It's entirely possible that it'll go to trial, but any jury would acquit on grounds of self-defense. If you're being surrounded and someone is approaching your vehicle carrying or pointing a gun at you, any reasonable person would take that as imminent danger of death.
A jury isn't "12 people too stupid to get out of jury duty". It is, as Massad Ayoob put it, "a 12-headed hydra with over a century of life experience and 12 independently operating bullshit detectors."
Edit: then again, this is Austin....