Spoilers - Question About Who Did a Thing
Okay hecka spoilers, you've been warned.
On the train, the Division sends literally dozens of agents to... do what? Kill Rachel? Not likely, as they need her to find the file. Abduct her? Why? She's going "home," which is actually to the Division, because she thinks the two Division higher-ups are her parents. Are the agents there to kill Aiden? It seems like they're after Rachel. If it's Aiden they want, wouldn't they have gone for him before he got on the train?
The movie is preposterous in terms of what happens, but the basic narrative makes sense other than this scene on the train. Why are there 20 or so agents firing guns and stabbing with syringes?
Also, when did you realize Ellly was Argylle? I figured it out when they were at the hotel and she was speaking to Henry Cavill in the mirror.