Perhaps Jen has a different way of correcting the dog. We have a snapshot of what was being done and don't have the total picture. I myself might do this differently from Jen but that doesn't necessarily mean she's wrong. I get the feeling Jen does have an effective training plan. And I would bet that Jen knows how ineffective it is to shout at the dog.
A while back I had posted a link to a video on training on the Winnepesauke River in NH, just to get a video on water work by a golden that loves water. What I didn't say at the time was that it was part of my steadying process and I had just steadied her. I also did not mention that in the video there is no check cord, no ecollar, no heeling stick but that doesn't mean I had no tools.

