Hi, all. While this did not happen to me, this case is well known within the PD I work at and saved a Sgt's life.
The Sgt in question was working a daylight shift and responded to a call of some guys breaking into the coin boxes at a local laundrymat. When he arrived, a scuffle ensued, resulting in one of the perps getting the Sgt's 3rd Gen S&W 5906 out of his holster and grabbing it. The Sgt managed to dump the mag before the perp got total control over it and the Sgt was greeted by the sight of the perp standing over him, pointing the 5906 at his face and repeatedly pulling the trigger. The gun didn't fire because of the magazine safety. Backup arrived and the perp was taken into custody (MUCH worse for wear but luckily without any extra holes in his hide) and subsequently sentenced to a LONG prison sentence.
In this case, the mag safety in the S&W auto saved the Sgt's life, no doubt about it. The Sgt was lucky in that the perp did not have any pressure on the trigger during the disarming attempt, since this will defeat the mag safety on these guns if the pressure occurs before the mag is dumped and is maintained until the trigger is completely pulled. If he had been carrying a Glock or the Beretta 92 he later transitioned to, he would have been a dead man.
While I have no direct evidence, I have read of similar stories with Officers carrying pistols with mag safeties. While I love my personally owned Glock 21 that I carry on duty, I do wish it had a mag safety for just this type of thing. While no safety is foolproof nor should any safety be totally relied on, it's just another layer in gun safety when something like this happens and the added confusion might buy you enough time to pull your backup gun and take care of the bad guy once and for all.
Bub