Craig Douglas, owner of Shivworks, and Nick Delgadillo discuss teaching and coaching in the context of Craig's experience teaching extreme close quarters self defense to people of all walks of life.
Craig is the best instructor I've ever had the pleasure of learning from, and I've been taking his classes since 2012. I'm STOKED to see him on Starting Strength (also, I first learned about and began Starting Strength based on recommendations from Craig's forum about 7 years ago).
I've never seen this guy in an interview. I've seen him knife fight is a car. Also in a barn. A hallway. A few other places. I've seen him put the blade on the wrong edge, I think that's him. Never once seen him talk like a rational human. Not sure I'm interested.
Sounds pretty close minded if you won't even listen to him. For example, Craig puts the blade on the reverse edge (not "wrong edge") for specific and clearly defined reasons that work well for his intended use. You might learn something if you genuinely listened.