I disagree with that analysis of time. I've seen folks draw and hit three targets with double taps in 2.5 seconds.
Maybe SOME people can do that, but I am talking about what most people can do. It just seems unlikely to me that some random junkie is going to have crazy wild west style fast-drawing and fast-shooting skills.
Of course anything is possible and we should train for many contingencies but in the case of Tom's scene the bad guy had no idea Tom was about to pull out a concealed weapon and fumbled just to get his gun out of his waistband or pocket.