His dog is way over threshold. And as a teaching / learning moment, it's highly unlikely she'll absorb ANY of it, including Ken's proposed correction.
IMO what he needs to do is physically back away from the stimulus. From the look of things - far, FAR away from the stimulus. To begin with, get between his dog and the distraction to break her line of sight and her hyper-focus, and encourage her to follow. Whatever it takes ... food lure, presentation of a toy, walking backwards, kissy noises, whatever. Then at a much further point away, establish attention and try the cue again. Distance is your friend. THAT'S where learning has a chance to occur.
The dog is giving him soooo much information, and apparently Zak's not heeding even one little bit of it.