The RC Theory says that fear is discharged with trembling &/or sweating as a visible outward manifestation.   
This article (by Stella) is not meant to be a definitive example of this process in humans (whom usually have learned to repress this discharge more than others, so it's very difficult to see it happening in practice), but it does suggest that it's a natural process in (at least some) mammals.

29th Oct 2011

The best demonstration that I've ever experienced of discharging fear was from observing my dog, Salamanca.    (She is a small ginger pekinese cross, and fits unobtrusively in my lap when I drive)

It was also the most conclusive proof for me to date that RC theory is very very sound: to see it working with another mammal so very spontaneously.

From when she was a puppy, Salamanca loved putting her head out of the window of the car when I was driving somewhere, standing up on the passenger seat with her paws on the car window sill.   When someone was sitting on that seat she would just climb on their lap and do the same thing (waiting patiently for us to open the window for her if it wasn't yet open), only she would be quite a big higher up so usually the person would spontaneously hold her, because then most of her body would be out of the car.

One day a friend had her on his lap, nose & chest out facing the wind, ears streaming behind, looking very happy as always... but I was chatting animately with my friend, he didn't hold her all the time and I didn't think when I took a big curve at some speed - and she was thrown right out of the window.    

I didn't see this, but my friend immediately shouted to stop the car, and later said that looking behind he saw her take a few tumbles then immediately run after the car.  So no big physical injuries, but she did get a big fright (as we did).

For some time after that (I don't remember how long) she would not stand by the window when we drove together in the car.   What she would do instead would be to come sit on my lap, and tremble.    
She did this for some time.      
Then one day she 'asked' for me to open the window for her.      
When I did, she stuck her nose out as usual, but then come back to my lap almost immediately, to tremble some more.

And it was really impressive - totally text-book RC stuff: she spontaneously asked for attention to discharge, then went and got herself re-stimulated sufficiently to come back to my safe lap to tremble some more, finding her own balance of attention ... and she just kept doing this, over and over (over many car-trips), with the periods at the window getting a little longer each time.     I just focused on driving, giving her relaxed attention, and inwardly marveling at this amazing process in action, & her intelligence.
Until one day she didn't need to come and tremble anymore.

She's 10yrs old now, and enjoys the car trips as she ever did (although, ironically, am not sure I have myself got round to discharging the fear from her fall, and still get a twinge of anxiety when I see her at the window on someone's lap :)

To me she modeled brilliantly the "Feel the Fear and do it Anyway"* thing, but with discharge, making great use of available attention.

* (famous title of a book that became very popular in England in the late 80s)