They can move. They even set up the subway car to let them be mobile. The brain is in the car. The servers in the subway station are the rest of the nervous system that lets it get into the surveillance feeds. Even if you disconnect from that the Machine is still alive in the car, but just probably blind.
No that is not what I mean.
Trying to wing it and moving their operation has a much higher chance of getting them discovered than staying put: something that has undisputed worked for them thus far.
And that does not even address the fact that if Samaritan's agents discover this hideout, it would be trivial to find the train thereafter.
Not my favorite episode, mixture of "no forward movement of the plot" and I never cared for Shoot, mostly because I don't believe Shaw, with her personality disorder, would fully commit down the sappy path of "your memory is the only thing saving me."
I first started guessing something was wrong, when the boat appears when she escaped, but once she basically hit the easy button and found Greer inside 30 seconds, I knew something was completely off, to the point it had to either be a fakeout (like what we got) or some disastrous result from having a shorted season.
I don't think the USB stick means anything. Just a part of a simulation that it feels Shaw "understands." It flat out implied it was Shaw's idea to Greer to implant that stick. The episode almost seems like it was written by Shaw, where her Hammer approach was completely successful.
Dunno, I never really bought Shaw's entire deal. Always seemed to me that the writers liked the novelty of having a sociopath on the team, but not so much the reality when it came to growing the character.
'Razgovor' both reaffirms, and then promptly rejects what she is. As does 'Devil's Share'. And after those, both 'Allegiance' and 'Death Benefit' are both on the 'fuck it, Shaw is sappy as fuck' train.
As Gen says in 'Razgovor', her emotions are muffled, but they are clearly there. And the longer she is around the other members of the team the more obvious it is that they thrive.
Either she is so good at faking them that they may as well be real to us, or she has normalized as she has become older.
Another option is that she just lacks empathy for those that do not provide some level of utility to her but is otherwise normal. Explains both 'Razgovor' and 'Allegiance', but not the disparity in reactions when it comes to Carter's and her father's deaths.