I bounced for around 15 years in two cities.
When you are the small guy (the one whom relies on martial arts and not strength things do change but all bouncers who want to leave the job with no bad facial scars should mention the following:
1) there is no stance to take. what gets you pounded is never the guy in front of you talking to you. It is his friends. First rule is when speaking to a perp your back should be against a barrier so nobody can coldcock, barstool/bottle you to the head.
2) Second rule is that you are to a person's flank, their side, your eyes and head should be looking indirectly at the person.... because peripheral vision senses his movement better. You will see it quicker if you are not looking directly at him. When it does come, never act defensivelly. if a sudden movement occurs and he is angry, an attack is coming, yu keep to his side and grab, hit with an open hand and grab, or go fowards and steam roll him out the door, before any cntact with his friends,,,, done properly his friends will not even know what just happened and will find him outside (in one piece).
Bouncing is never about fighting. This guy is an example of the type you get who real bouncers do not want to work with... a young punk with something to prove. You do not hit people with a punch.. you might use atema waza that is more deceptive.
One thing about this book is true: There are a lot of clowns like this guy and real bouncers have to put up with them, i had too and they are a danger to everyone in the club, usually the owner's nephew who studies the arts and wants to show uncle what badass he is. When I worked thge door at the DNA lounge one of these types got a bottle over the head during Hip Hop nigh and that stoppe his bouncing career.