"I think he is talking about something a little more complex than the typical "you'll fight like you train" type cliche'.*
The fact is that most people will not know how they will react until they stress themselves ... its a great idea to try to do that in simulation training before finding out in a real situation.
*As for the whole "you'll fight like you train" concept, there is way to interpret that phrase that might make one think that they can out-train natural human reactions to fear/startle, etc.... while you can learn to manage them and work with them more efficiently, they are still going to exist at a fundamental level. The phrase SHOULD be interpreted to inspire people to "Train like you'll fight" and work with the body's/brain's natural reactions as part of your learned/planned responses.
Again, high level reality based training can help with that as well.
-RJP"
For many years I've been I've been participating in a men's personal development program that began with an incredibly challenging three day "retreat".
During one of the course processes in the middle of the night it took the stress of a situation to reveal to me one of the most valuable insights I've yet to discover. (By the time this process started we were all very disoriented, stressed, and pretty much scared shltless.)
Unknown to our team, the process called for a surprise diversionary attack by trained, process leaders who flashed cameras in our eyes, created loud noises, and attempted to "steal" a heavy log which our six man team was strugging to carry.
As a middle man, I had my head down (blind in the black of night) and mind focused on following my leader's every move and command. When the diversion team started their ambush I reacted as if it was a genuine attack, and without a second thought, I not only disarmed the guy with the flashing camera, and before I "realized it" I had the camera lanyard around his neck and was in position to choke him from behind.
He quickly tapped me which, I guess, snapped me back to "exercise" reality, and, to tell the truth, I was pretty shaken up not just by the ambush, but by learning that I possessed the "hidden" intent to really do someone serious harm.
I've been a certified mediator and I'm a professional trainer in confict management, but I now know I carry the "flip side shadow" of reacting with force should it ever become the last and only option.
"Self awareness" is proving to be one of the most important, if not
the most important qualities of self defense I know.
Hope some of this makes sense to someone besides me.