All the competition with friends is complex and troubling. So it's almost a relief to get down to some competition with enemies. Here Tris is in a meeting with Jeanine Matthews, and by "in a meeting," we mean something like this. But even while Tris knows that Jeanine is "an attack dog," she doesn't understand why they are fighting. Which points to a larger theme of the book—are these factions and this system of government really worth all the hullabaloo?

There's that phrase again: "faction norms." What's fun about this moment where Tris invades the Erudite library looking for her brother is that she notes the Erudite norms (wearing blue) and talks about that a fair bit; and then she very briefly mentions how weird this looks to her because she's used to "dim lighting and dark clothes." Why is used to that? Well, because that's the norm of Dauntless faction.

Here's one good thing about secrets: yes, they can drive a wedge between you and your friends (see above), but secrets can also drive a wedge between you and your enemies, which is handy. In this passage, Tris's secret is laid out clearly for us in the line about this making Tris feel sick to her stomach and strangle-happy. But all that is on the inside; on the outside, Tris is willing to lie and manipulate Jeanine to get what she wants.