The reality, is even if you were packin at the time there is no guarantee you will get to use it to save your life. Things happen so quickly, sometiimes fleeing is the only option. Having a weapon at your disposal definately helps though, train..train..train...! Also please carry condition one. Condition three is senseless. Situations unfold so quickly that you will never have time to rack one in. Glad to hear you were ok and that "pos" got what was coming to him.
Being AWARE of your surroundings and of individuals in your proximity is what buys you time to decide if and when to brandish your weapon. If you're so oblivious to your surroundings that some guy or guys CAN surprise and bushwhack you, then you need to practice your OBSERVATION SKILLS. That means looking over your shoulder, constantly scanning your surroundings, watching for suspicious behavior, and anticipating a confrontation. I mean, NOBODY should be able to approach to within 21 feet of your person, if you're on your guard.
Have you ever watched all the potential victims in large parking lots? They exit their vehicles, facing straight ahead and focused on the the nearest building entrance. When they exit the building, they face straight ahead and focus on returning to their vehicles. During this time, they are TOTALLY OBLIVIOUS to the "big picture" of what is going on around them, they're basically BLIND except for whatever is directly in front of them. Most victims are, in fact, surprised from behind while returning to their vehicles.
Simply BEING OBSERVANT will save your ass, most of the time.
Also, you shouldn't be walking around with one in the chamber, ESPECIALLY if your semi-auto is a Glock. All the Glock's safety features are internal, and it's JUST WAITING for your fingertip on the trigger. You read about cases
all the time of some guy carrying his Glock with a round in the chamber, reaching suddenly for the gun and discharging it into his thigh or hip. Sometimes fatally. DON'T keep a round in the chamber.
I mean, if you know your weapon, you can draw it to presentation and rack the slide
in about 1 second. I've timed it, and I've been timed. Not coincidentally, a human being can sprint from a dead stop to a distance of 21 feet
in about 1 second. Meaning, if you allow a suspicious character to approach to a distance of 21 feet from you, he can be ON TOP of you with a knife or a blackjack or whatever
in 1 second.
You have to BE AWARE of everything going on around you, you need to WATCH suspicious people and LET THEM KNOW that you're watching them. This is called DETERRENCE. And if you're being approached by a suspicious character, you should already have a master-grip on your firearm before he reaches that 21-foot limit — this is when you say, in a loud voice,
"THAT'S FAR ENOUGH."
Yeah, things happen quickly in an altercation, but MOST of your surprise is due to your LACK of OBSERVATION. If you CAN be surprised, you WILL be surprised, and you'll be another victim.