I think I see where you're coming from. But in this case, couldn't over-thinking still fit into his framework of people "[holding] the minds of other men, not objective reality, as his ultimate psycho-epistemological frame of reference"? For example, people who stutter are normally very sensitive to how a listener is reacting. I can see it both ways here - as not being able to recognise where our thinking ends and reality begins - or as interpreting our experience through this second-hand reality. Hence, the break would amount to the same thing as a disengagement. If that makes sense?