My bad, it's file 4 & 5 of the audiobook, but the second part of chapter 2 and chapter 3. Chapter 2 deals with the reciprocity rules and the bit that was used on your uncle is Retreat then Concession. A retreat from the vaccine and the concession of a PCR test. People are hard wired to reciprocate and to do a concession to someone who has done a concession to us. Chapter 3 explains how if you get people to do a small action, it can change their perceptions of who they are and increase their willingness to participate in much bigger actions. It also touches on how consistency is used against us for much of the same effect, amplifying the previous effect. The example in the book is of the great success the CCCP to brainwash the POW into advocating for communism (it's also very analogous to how school operates).