Okay, so we've had some responses with some great thought processes on how to extricate or survive this type of meat grinder.
Here's my own thoughts, it involves mindset, prior training, prior experiences on the street.
Mindset, take the fight to them at the first opportunity, go offensive and put them on the defensive as soon as feasibly possible by taking incoming
Skills, they are there in my world through years of training, years of competition. A better than average draw stroke from concealed, and a minute of man mentality [ where I'm not trying to put bullets in any particular area of their bodies except COM ].
As Bnbullets mentioned, it may take more than one shot to take any of them out of the fight. That's a gimme for me, but I want all 3 of them damaged before they can throw lead in my direction. That can be accomplished without much ta do about it [ I know what I can do and at what distances I can accomplish same ] out to 7 yrds. And this is where the rubber meets the road, most people who carry a gun aren't as confident in making their hits count, let alone making hits on 3 BG's count before any of them can respond with their own outgoing.
Engage at first opportunity when none of the 3 pair of eyes are looking at you, make the hits, go back to those who need another or a few more and if one of them is about to get a muzzle on me [ we are keeping track of them in peripheral right? ]. Before engaging, I'll decide which one needs taking first based on circumstances, in this scenario, the one playing over watch on the employee/s [ he's going to be faster to respond to incoming over the other two who are distracted scooping up the firearms they can grab ].
So, the first guy gets hit, the remaining two are hit within 1 second and probably a little less than 1 second [ and that's slow where transitions are concerned ]. Now they are all damaged, and without hesitating one returns to those who may think they've still got some fight left in them. Might need to do a second round of boarding house rules on a few of them, but they've been damaged so there response will be less than otherwise.
In this drill which I was asked to perform by a gamer [ I guess some of them practice this scenario often enough ] years ago, if I'd instead of putting two on each, and placed one on each from the draw [ and I'll be at the 1-1.2/1.3 seconds from concealed ], I'd have #2 and 3 shot [ after that first shot connects with the one I decide needs to go first ], in .80 seconds. This at 4 yrds, but there's no difference between 4 as in this drill and 6 or 7 yrds for all intents and purposes.
I may or may not move on them, I may move on #2 and 3 but stand and deliver that first shot on perp 1 [ to be determined based on circumstances ]. My split times in this video are .17 seconds [ and can be faster ] and my transitions are .28 seconds. The threats are 6 feet apart COM to COM.
No time to dilly dally, just get to work solving the scenario presented. With splits and transitions, after the first shot on the first perp that starts the party, the other two are shot within .9 seconds. Rinse and repeat as necessary. BTW, I was using the Quick Kill pistol skill in this drill.
Determination to control my own future, not allowing another to dictate it. Focused on the task at hand. I may die there or they may, but they aren't going to dictate my future. I am.