I don't give a rat's ass if the BG was running away. He was still in possession of his own firearm and was firing back around his body as he ran. Shoot him in the spine and drop him like a stone, I'd still no-bill the employee if I were on the grand jury.
And yeah, mom and baby, 20/20, yada, yada. I'm only moderately concerned by the fact that the GG's sidearm was slewing in the direction of the child, but when the lead starts flying, it's a sign of that woman's lack of a self- or species-preservation instinct that she didn't cover her own child's head, turn so that she was between her child and the gunfire, and drop to the floor.
I'm confident, based on what the GG was able to do, that he had the wherewithall to not do bad things, like pull a Gen. Custer (who once shot his own horse in the head at a full gallop) as he's bringing his gun around and accidentally shoot the baby point blank, had the BG wound up continuing to run out of the door.
The thing I'd be concerned about was how the guy used his large female coworker as a pick to shield his drawing of his sidearm. It seemed like he was whispering into her ear what he wanted her to do at that critical juncture. When all and sundry are already staring down the barrel of a BG is not the time to strategize.
That should already have choreographed with his coworker before hand over lunch time breaks. "Yeah, if anyone ever tries to rob the place, I'm packing a sidearm under my shirt. I'll use a coworker as a shield to prevent the BGs from seeing me draw it and then as I pass behind that coworker, that coworker needs to GO IN THE OPPOSITE DIRECTION, BECAUSE I'M ABOUT TO DRAW DOWN ON THE BGS."
Imagine if she'd gotten confused or panicked and when the GG went to pass behind her, she'd gone in the same direction and she and the GG started trying to dance a ballet of the GG trying to get a clear shot. The BG could have noted something fishy about the GG and aimed for him before the GG had the chance to get his own firearm up and level. Even better, what if the girl had been a hoplophobe and when the GG whispered in her ear, "Here's what I want you do to. I've got a gun--" "YOU'VE GOT A GUN TOO???" Nothing good comes from springing tactics on an acquaintance who has no capacity for tactical thought.
This is an old video, and yes, it's an editted video. It's missing chunks, and the encoding is flaky. I've never played it back smoothly from beginning to end, it always hiccups at various points that aren't represented in the video itself, meaning it's actual playback and not entirely a symptom of the encoding that makes it damn hard to keep a sense of timing and pacing as this particular spectrum of feces intersected with this specific pneumatic oscillator.