I haven't watched the clip, my internet is bad right now, but I don't think any of us are in a position to criticize Les Vogt.
Have a little respect for the man - He's accomplished more in a lifetime and had great (Not good, but great) horses, something most of us will only ever dream of. He's a better horseman than the entire forum put together. I've seen his work firsthand, and it's important to remember even if you have been riding for years and years you can make a mistake.
From the sounds of it there was some misinterpretation of bridling a horse up, or him using his hands. A cowhorse has to TAKE that. Bash it all you will, there's no room for error or a lift of the head in that class. You take their head and leave them alone. If they raise up, you take it back then leave it be again, until they travel with it in one spot and respond to you driving them up from their hind end.
I'll watch the clip later.