Dave. here's how the 935 works. There is a linkage that connects the bolt the the operating spring in the buttstock, this link is shaped like a tuning fork (a "Y"). The connected end is attatched to the bolt, the two parallel arms are connected to the operatin spring. as such, the hammer must fit between the parallelbars to make contact with the firing pin. The Y on the linkage is set so that the bolt must be ENTIRELY closed for the hammer to make contact with the firing pin. If the bolt is retracted (unlocked from its lugseat) at all, the hammer hits the linkage instead of the firingpin. The way the system is setup, the hammer will fall with the bolt unlocked, but it will not contact the firing pin. This exact system had been used on the remington 1100, and its predecessor the sportsman 58, for 50 years; It works. As such, the only way an dishcarge could take place is if the firing pin broke, and seized in place, while protruding from the boltface. The mossberg uses a 1 piece, spring return firing pin (like almost all other gas guns), which makes this situation very unlikely. Even in such an unlikely event such as a shel firing as a result of a catasrophiic FP failure, in the ejection port as described in the report. the gasses would be vented out the port and barrel, this along with the fact that shotshells only operate at ~11k PSI, means that the one piece steel mossberg bolt would be very unlikely to "shatter", you'd likely loose an extractor, But thats it.