Chapter Thirty

Tris goes through her fear landscape, filled with the same fears we already. She finds that each represents more than what it seems.

The crows represent control--or rather, the fear of not being in control.
The inability to escape the tank is the fear of being weak, and having it on display.
The ocean is also the fear of lacking control.
The Peter centric fear represents her fear of not being accepted into Dauntless, and it seems like a fear of ignominy  which of course, would make sense for someone who has to hide all she does.
Her fear of intimacy... Is, well, a fear of intimacy. 
Shooting her family represents her fear of them falling apart--and her decision to die shows that she will do anything to hold them together and close.

"Selflessness and bravery aren't that different."

If there was any indicator that Tobias was totally Divergent it was that line, both when he actually said it, and when it comes to her mind in the face of using her Divergence. It was a fast paced chapter, but it gave us a good look into the more solid parts of Tris' characters--the deeper parts that won't change with simple changes in serotonin and oxytocin production.