In this passage, the author explains that people often do not understand the specific actions others are taking, but they can sense the emotions behind those actions. When someone feels guilty or dishonest, their emotional state affects those around them, causing a ripple effect of confusion and uncertainty.
The quote highlights that this emotional feedback acts as an unconscious warning to others, signaling that something is off or suspicious. As a result, observers tend to distance themselves, sensing that something is amiss even if they don't fully grasp what is happening.