san francisco resident bill oxadean is about to find out. ll is in his garage when an armed man suddenly rushes in. >> he looked like a hitman to me. it looked like for some reason this is going to be the day that i die. someone sent someone to kill me. >> a gunman threatens you in your own home. you're unarmed. what's the first thing you should do? a, get your body away from the gun barrel. b, go on the attack, aiming for the assailant's body, or c, try to take the gun out of his hand. not everyone is strong enough to fight, but royal gagnon who teaches krav maga, a form of self-defense offers this tip. >> when i have the moment to react when he's not expecting it when he looks left or right my goal is to go sideways. >> the correct answer is a. watch for the right opportunity and then get away from the gun barrel. don't discount decisions b and c because they're the next steps to surviving an armed assault. >> number two, i have to remember the weak spots of the body. i have to strike to the weak spots. in this case i can do a knee to the g