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When the 2 robbers come in, 1 of them goes off screen and you can't (from this video) determine where he is at to be able to decide if you would have enough time with him and the shotgun assailant watching to be able to draw.

That being said, as all of the patrons were put on the floor, if you had the opportunity to draw, it would seem there was a safe firing lane to the robbers without hitting the patrons.

So, if I assume I had a safe firing lane, and I had the time to draw without being compromised, would I shoot? From what I saw, yes. I would.
Now, would I really, if I were in that situation? Well it is easy to armchair quarterback it, but I hope I would.