Thanks for posting about your experience Maxx. It's very similar to what I've heard and experienced myself, and again one of the reasons I prefer impact weapons to a knife. I know several people who have been stabbed, and none of them realized it until after the altercation was over. I was also with a friend when he was shot through the hand. We didn't even realize he had been shot until we ran a couple of blocks and stopped...at which point he passed out.
Aside from a person likely not feeling pain during an altercation, your experience reemphasizes two training/fighting points for me:
1. Focus on techniques that will disable due to physical factors (not pain)
2. Use triangular footwork to stay standing, and get out fast
I love Pekiti/FMA training more than anything else, primarily due to the emphasis on triangular footwork and blades. In boxing, it's fine to block a low blow with your arms (or elbow ideally). It's no problem to move straight back with a cover, and then straight in with a return, etc. If two fighters have machetes though, the dynamic drastically changes. You're not going to be blocking a machete by covering your head with your arm, as you might deal with a hook. Against a machete you better have damn good footwork. You need to get the hell out of the way when an attack is coming in. And if you're on the attack, you need to get in in such a way that you're certain the opponent is unable to continue, or you need to get in and get out, FAST.
I think this has real applications in self-defense, but less so in sport training. In self defense you can use triangular footwork with a finger in the eye. I've done this to others and had it done to me, and it works extraordinarily well. You can't zone back and away on a forward/male triangle and hit the person in front of you with a hard punch. Because you're moving away it's just not going to have enough power to do anything. But you can certainly do the same evasive movement with a simultaneous eye jab. You can use the eye jab equally well with a deep evasion on a reverse triangle, on the way to a fast exit. This technique, the eye jab with evasive triangular footwork, follows BOTH of the principles above...disabling a person physically and using footwork to stay standing/get out.
If there is no room to step OFF the X, then you might need to step INTO it. I like what I call the "smack and hack" for this, stepping into the opponent via a forward/male triangle. I believe Crafty calls this technique a "bracial stun". I call that a "hack", and proceed it with what is basically a pak sao...smacking the opponent's arm on the entry making it nearly impossible to block. If the hack doesn't drop the opponent you can immediately transition to a "head and arm control" via an underhook/kimura type position with a face push, or an underhook to a duck under and take the back. I prefer the "head and arm control", because the opponent cannot reach you with his far hand, and you can repeatedly knee his face, puter kepala, etc., etc.
Those are just two examples of combining techniques with footwork that do not rely on pain to disable the attacker, and getting out right away if possible. I think your situation Maxx highlights the necessity of a couple of "default responses" that are HEAVILY ingrained, vs. 100 different options. And, I think those default responses need to be based on the above two principles.
You said you had a folder at the time but didn't even realize it was there. This most certainly highlights the reason everyone must train empty hands first.