Really? Tell that to the french ring dog that quits when esquived!
"It's no different than making noise with the clatter stick or using the whip to incite aggression."
It's very different. Whips and clatters are cues that things; are safe, the same, and familiar. HUMAN pressure is VERY different even if done in "prey". It's the HUMAN which needs to be the focus of the dog. Yelling and movement are natural & real activities of the real target...the human. Both are primal to the dog who is also a primal being.
PS, "intense prey drive" as u put it, is the catalyst of fight.
E-Dog - 2012 WPBTCA National Championships
The time when screech owls and Bandogges howl and spirits walk and ghosts break up their graves.
Act I, Scene IV of William Shakespeare's "King Henry VI"