Stare in the direction of the illegal and dangerous assault weapon noise, carry around a pen to take notes; if necessary, write down details on your hand. Be sure to note:
Whether the lone, white, mid-20's gun nut assailant is wearing an NRA shirt;
If the lone, white, mid-20's gun nut assailant is driving the white box truck or the white Astro van;
Any facial hair or details of the lone, white, mid-20's gun nut assailant which might aid in a composite sketch, and;
Disregard any shadows or adrenaline-induced hysteria which tends to make assailant briefly appear Middle-Eastern.
Racial profiling is sooooo un-PC. In that case, they have no choice but to protect the identity and privacy of the shooter. So let's all just put these shootings behind us, and simply move on, shall we?