They transition in to what I call 1/4 rhythm squats. Which emphasize much more of a switching moment. In those the knee joint angles are much greater and I suspect that despite the absolute bar load being less by 10% that the joint moments are probably 50-100% higher because of the demand for rapid deceleration and acceleration in an opposite direction. I will say that I have done them with up to 130% loads. Those are what I’ve referred to on this board in the past as fast eccentric power development. Fast because the eccentric phase is very quick due to the load, and eccentric power (rather than strength) because a huge amount of work is being performed in a very short period of time. The load crushes you in like 1s and I know it’s pushing the limits of safety (which is why I’ve only used it a couple times) but recruitment has got to be off the charts from all the research on such activities when performed in a lab (typically using single joint exercises and isokinetic resistance).
Thanks for the answers!
If I understood your description of 1/4 rhythm squats correctly I have done them for over 10 years during precomp and comp.phase (load 90-130% of full squat). I have been playing with the idea of experimenting with supramax.eccentrics this year and I think I will use a similar transition as you have planned for Nick.