If that man had Watson, he would have crushed him when working on the stock. If I had his dog I would have been very frustrated with a hard headed dog. Compatibility is very important. All schools worth their weight go through the expense or their volunteers do, to make sure all health checks have been done on their dogs. This is really important because these dogs go under more stress than the average dog.
Any discomfort can lead to abnormal behaviors.
Anyone can train a dog to do tricks. There is a certain work ethic that goes with working ability. That's a good work ethic. Training the dog right also takes some good timing. A good trainer also knows how to read body language, add pressure when needed, take pressure off when needed, praise at the right time and be consistent.