Fidgeting, Related to CT Theory and/or Specific Function(s)?

As I mentioned I would, I've been keeping an eye out for fellow "fidgeters" and I believe I observed a FiNe having a very similar fidgeting habit.

Although their body was rigid, their feet/ankles consistently bounced/went to and fro.  Ironically, this was most consistent when I could tell the person was engaging in Fi, where they would "go into themselves" (disengage down) or somewhat when their eyes were naive and blinking (Si).  The fidgeting would become erratic when they began observing the environment, but the fidgeting didn't stop.

The only time the fidgeting would stop is when they were engaged in the outside environment, i.e. someone would ask them a question or an announcement to the class was made.  But almost immediately afterwards, the fidgeting would begin again.

I will mention that a polite impatience could have definitely played a role in this as we (as parents) were all waiting for our kids to finish up with their class and this FiNe did not have a book, magazine or phone to distract them from waiting.  However, observing all the other waiting parents did not yield many "fidgeters", even though they themselves were also waiting without any means of distraction.

So what can we derive from these observations?  Anything?

In my own little mind, I'm beginning to equate "rigid posture + quiet fidgeting" with at least TiNe and FiNe types - not sure about Se users yet.  But it seems like fidgeting could be a TiNe or FiNe's way of being buoyant, similar to their NeTi and NeFi "cousins", but obviously considerably less?  Just wondering if this could possibly be one of those tell-tale signs in Visual Reading, similar to Fi pained expressions?

Your thoughts?  Anyone else observe the same with dominant Ti and Fi users?  What about "auxiliary" Se users?