Making a horse buck seems to be a bit backwards in the way of training.
I've ridden a lot of buckers and I get them through it by ignoring them. "Sure, you can buck if you want, but we're not going to stop working." I don't discipline for bucks. I kick them in the ribs because a buck is a refusal to go "forward", and a kick in the ribs is a reminder to go in that direction. I've never whipped for a buck, it invites another buck and encourages the habit.
The sessions should be about work, not focusing on the bucking. The horse can do whatever the heck it wants to do, but we're stilll working. It doesn't matter if the apocalypse is happening. After a while when the buck is ignored, the horse will no longer do it because there was no reaction when it happened other than "Yeah, right. More work".
Telling it to "buckbuckbuckbuckbuckbuck!" instead of giving it something to refocus on is backwards. In training, you redirect the negative energy into a positive step, you don't focus on the negative and make them perform bad purposefully.
There was a couple times she smacked that horse for no good reason. I don't care what the story is, I would have taken her straight off the animal. I will never believe that this is appropriate, or an appropriate way to break a horse out of bucking by lacing it over and over again. A whip should never be used this way. That's why too many people consider it an abusive device instead of a training tool its meant to be.
And those who were seen dancing were thought to be insane by those who could not hear the music