It's what started me down the path of figuring out how to finally describe exactly what "see what you need to see" means to people who need a clear explanation.
It didn't take immediately. I struggled with the concept in his class. It wasn't until after his class when I was on the range experimenting that I figured out the rest of it. I drew to a hostage plate at 25 yards and saw white through my rear sight window and my front sight was surrounded by white and I just sent it with no further prevarication. It resulted in hitting the dead center of that plate and spinning it, and then everything crystalized. Distance didn't matter. I didn't have to check my sight and re-check it and worry about whether it was good enough.
I just saw a "go" signal I could process as a "go" signal quickly and went. And it worked. And now I knew what I wish I could have told myself 20 years ago about using sights.
So far in class it's been something clients have found immensely helpful.
I think my strongest asset as an instructor is that I'm not exceptionally gifted or talented at any of this. My eyesight isn't superior, I wasn't born with exceptional hand-eye coordination, etc. I've had to learn most everything I know the hard way, usually through repeated demoralizing failure. It's not the most enjoyable process, but the one upside is that I think I understand what a typical person is missing when they come to training and I can focus on bridging that gap.
Ashton and I say outright that what we teach in our pistol classes is the stuff we wish would have been explained the way we explain it 20 years ago.
Everybody who has ever fired an accurate shot with a handgun has had to use the exact same process because it's physics, not magic. Understanding the process properly creates vastly superior results.