Both reported Byers was holding the gun sideways "gangsta style," and that Byers' window was rolled up when he allegedly pointed the gun at them.
Gee. They've been watching too many Steven Segal movies. Segal can actually shoot pretty well with that sideways hold, but it's definitely not the recommended method. Given that gangbangers don't practice with the weapons (after all, that would be acting responsibly, something they manifestly don't do), that combination of factors will conspire to send the bullet almost anywhere downrange but where the idiot actually wants it to go.