Man he got lucky on that one. I've had one ND that ended with an embarrassing hole in my Man Cave wall. It wasn't anywhere near my person, thankfully.
I tend to gravitate toward guns that have manual safeties/revolvers for pocket or deep concealment carry. I'm totally fine with Glocks and other striker fired guns with passive safeties if they are housed in a duty holster. I rarely find myself carrying such a gun in such a way though.
My pocket gun of choice (beyond my micro .22 mag) is the S&W Bodyguard. 380. The long DA trigger makes "safer", but I do wish it was a tick lighter or shorter. I find the LCP II easier to shoot well, but the trigger without a safety gives me a bit of a pause. It's not light, exactly. But it's "quick". I think the same external hammer of the BG married to a shorter pull would really make the gun shine. As it is, I have to walk my shots back in rapid fire as they pull to one side or the other due to the size of the gun. On the plus side, I would have to really be not paying attention to have an ND.
Part of the reason I like revolvers is that they are simple. No manual safeties, no magazine safeties that may or may not allow the gun to fire without one (if you have various guns of various flavors that support or dont support that), and you can just look at the side of it to see if it's loaded. You can of course open the cylinder and check as you should, but even a glance toward the blast shield can verify that if you see brass you need to watch your....keister
because its loaded with SOMETHING. Might be empty cartridges or whatever, but obviously it's not wise to go yanking the trigger if you see anything obvious.
I hope the injured party heals quickly and learns a lesson. Guns are dispassionate to our lack of safe handling and Lady Luck is a fickle mistress.