Take down- Get out of the path of the bullet. Isolate and neutralize the weapon Neutralize the opponent. The rest is all style.--Believe it or not, this is almost all Aikido, though he's using some force, since his attacker has little momentum.
Preparedness Month: Top 20 Survival / Prepping Books To Get - SHTF, Emergency Preparedness, Survival Prepping, Homesteading. That's a great start but it overlooks the topic of self-defense/defense of your family.