Aside from the bitchpunch, I fully endorse defending yourself equally.
If someone is threatening your life, I say shoot the threat if you choose a gun.
I also say if someone is being a bitch enough to use a gun in that way, you bring a bad name to guns, you spotlight a problem with out total loss of patience and common decency. No one wants to work anymore, it's easier to take.
And hell yes, I say bash his damn brain in with the board if he's going to be pussy enough to bring the gun into it.
Someone just send me to orbit, I want off this planet.