Idiot here was returning my 357 Max to the closet back in the spring, and while walking down the hall I was fiddling with the hammer and feeling the trigger let off when the hammer slipped from under my thumb. The sound the hammer made was sickening. I tried to open the barrel....not a chance. Broken firing pin. I have dry fired rifles, revolvers and pistols all my life. In fact a major part of my bullseye practice was dry firing my 1911 at least 100 times every other evening. This one time with the Handi is the only time I have ever broken a firing pin, and yes the manual plainly says, Do Not Dry Fire.
Edit: The best way to practice or dry fire with the Handi is to either use snap caps (cheap enough) or keep spent cases and snap against them a few times. The primer will get deformed enough to not protect the firing pin, so keep it to 3 or 4 snaps a case, change it out and go at again.