Interpenetration Example and Question

In a recent game I got into a bit of a muddle with interpenetrations. In part my own fault and I think I have cleared up what I was doing. Asa result I put together the following example. It has left me with a question (see final slide).

I had problems loading up the images. They can be seen in this blog post:
https://onesidedminiaturewargamingdiscourse.blogspot.com/2020/08/basic-impetus-interpenetration-example.html

The question I have is contained in this image:

par 5.7.2

In this case you can choose between push back both Infantry and Skirmishers (both disordered) or let the Skirmishers (only) be interpenetrated by foot and maybe cavalry (if cavalry goes back enough to touch the S. Still your choice.)