Ladies and Gents,
You will do as you trained. I'm not certain about the story about the gun, but I am aware of a story about a cop who was fighting against an aggressor and the thing degenrated into a ground fight. The good guy had the bad guy in a submission hold and was winning, but the bad guy tapped him on the arm (tapping is equated with giving up in this type of training). The good guy released his hold, as he'd been conditioned to do, only to realize this was real.
I got this story from the DT instructor of the agency where this happened.
I teach a pause at the end of the technique. This means that you release pressure slightly (not continue with it as you'd do in combat), and pause. Then slowly release and recover. With the gun scenario, I suggest disarming, creating distance (or aggressing the adversary as the case may be) ,and then pausing after you've dominated the scene, before giving the gun back. Its the same kind of focus we have when we do the after action assessment after shooting. The japanese call this Zanshin and can be described as lingering focus.
Cheers,
Gabe Suarez
Suarez International USA, Inc.
htp://www.suarezinternational.com