You're right, that second shot, the double tap, is important with a handgun, especially the lighter calibres like 9mm. Being able to back up quickly and accurately is the key.
I'm not so good with a shotgun, not bad, just better in long guns and handguns. I'd still not advise standing in front of me if I had a shotgun and the intent to use it though. I can hit stuff.
I hope you're well and you have a good weekend ahead.
I may or may not have a hallway gun in my bedroom. Pistol grip short barrel 12 ga. Nobody will come down my hallway.
Haha, I'm not surprised.
Well, they might...and will probably wish they hadn't!