Fits the description of a ND. So from the story we know that whatever the circumstances the they didn't fire the gun under water. The bullet was still a live round, because of what we learned later.
Back on board the boat, with a gun, loaded with a live round. The kid broke several rules of firearm safety. They didn't know that the round was live or dead, it was live. He put it politely by saying "slightly tapped the bullet", however what that actually means is that he did fire the gun again, or did willfully "tap", "strike", whatever the firing pin of the gun, and discharged it, negligantly. Every gun is to be treated as if it were live.
He broke rule number 1 by not pointing the gun in a safe direction ie, his finger. He broke rule number 2 by not unloading the gun when onboard the boat. Broke rule number 6 by not treating a misfired gun with care.
I agree it started out by a simple misfire underwater, but what occurred on the surface was a violation of several rules of firearm safety, and thus is a ND as a result. If he had followed rules 1, 2 and 6, there wouldn't have been a discharge on the surface..
---------- Post added January 1st, 2014 at 07:43 PM ----------
an accidental discharge becomes a negligent discharge when the shooter looses control of his firearm and it discharges. Given that he had it back on board the boat after a misfire and didn't handle it properly, through lack of training, doesn't change what it is. A pure accidental discharge or is say, having a really old fire arm that has a mechanical failure while not interrupted by anything else and fires. A misfire has nothing do with an a AD or ND. A misfire in this instance happened before the chain of events that lead to the ND.
Just like in scuba, there are no really "accidents", just failure to handle the situation properly for some reason or another. With guns, it can be just as deadly..