What a strange video. Her horses are obviously not as food motivated as mine. I assumed that the cantankerous Pinto was eager for a meal, yet he left the food to come back in the barn and cause mayhem. And I definitely got the sense from her behavior that she was expecting trouble. Bad deal all around.
My horses absolutely do not behave anything like that! No matter where they may be going – into the barn, out of the barn, out to pasture, etc. As a result I frequently cut corners by leading one and having one or more follow. The worst that happens is that one of them discovers some hay on the ground and I have to go back with the halter and catch the perp. I do have one young mare who wants to barge out of the gate with whatever horse I’m taking, so she doesn’t get the privilege. If I want to cut corners and she’s involved, she’s the one that gets the halter.
PeteyPie from reading your descriptions, I have no doubt that you will recognize if anything happens to make your approach unsafe or unwise. You seem to have a perfectly fine grip on things!