Actually Massad Ayoob himself addressed this, in discussing revolvers vs semi-autos in close-quarters work.
Contact Shots
"Revolvers win in this category, too. A cop I know recently retired after three-plus decades of police work in a major city, and many gunfights. In the very first of those, a would-be killer wrestled with him, belly to belly, trying to bring his weapon to bear, and my friend rammed the muzzle of his S&W revolver into the man's center chest and pulled the trigger. The press-contact shot sent the muzzle blast into the attacker's thorax along with the bullet, killing him instantly.
Many autoloaders would have been pushed out of battery by that kind of desperate pressure, activating the trigger disconnector and preventing the good guy's gun from firing. There are a very few autoloaders that are immune to this because of their design.
Springfield's XD series pistols will work at press-contact. Another notable example is Beretta's Nano.
But any contemporary revolver will fire every shot at press-contact. Even the autos that will go off when you need them to in that situation can be jammed by viscous blood and flesh globules being blasted back into the barrel bushing area as the slide cycles from the first shot. I know of at least one case where that happened in an actual gunfight, costing an officer his life. He instantly dropped his first attacker with his 9mm auto, but was shot fatally by the second because his gun didn't work when he pulled the trigger again. With a revolver, he would have been able to continue firing."
He also had this to say about the Sig P320:
"The first thing I discovered about the P320 was that it has a "stand-off capability," a good thing. This means that if the muzzle is pressed hard against a firmly resisting surface (like the chest of a murderer about to kill you) it will fire, instead of going out of battery and failing to discharge, as most autopistols will. It amazes me that more people don't test for this, and amazes me still more that manufacturers who put this potentially life-saving feature into their autopistols don't advertise it."
So, I understand this isn't important to some, but if the bear is on you, might affect your choice of weapons.