Quote 40
I stand next to the chasm. I hear the roar of the water. I scream into the hand that covers my mouth and thrash to free myself, but the arms are too strong; my kidnappers are too strong. The image of myself falling into darkness flashes into my mind, the same image that I now carry with me in my nightmares. I scream again; I scream until my throat hurts and I squeeze hot tears from my eyes. (27.38)
Tris may be going through a part of Lauren's fear landscape, but it's a fear that just happens to line up with her own recent experience of being powerless when Peter attacked her. We can see here the long-term consequences of powerlessness, since her experience with Peter leads to her being afraid here. Other consequences of powerlessness? Nightmares, and, oh yeah, death.
Quote 41
This time, I do not hit the bird as hard as I can. I crouch, listening to the thunder of wings behind me, and run my hand through the grass, just above the ground. What combats powerlessness? Power. And the first time I felt powerful in the Dauntless compound was when I was holding a gun.
A lump forms in my throat and I want the talons off. The bird squawks and my stomach clenches, but then I feel something hard and metal in the grass. My gun. (30.5-6)
As Tris (and Four) make clear, Tris's fear landscape has a lot of powerlessness in various forms (birds, drowning, ocean waves, etc.), because Tris's big fear is losing control. But since people can control their fear landscapes, Tris can summon a symbol of power to combat the symbol of powerlessness: gun vs. birds. Although if she can control the fear landscape, why not get lots of guns, Matrix-style?
Quote 42
My father says—used to say—that there is power in self-sacrifice. (38.24)
Look at that interjection, that tiny little reminder that her dad is dead. (As if we'd forget.) Because her dad has—excuse us, had—a theory of power, and because he put that theory into practice, he's dead now. So was his self-sacrifice a form of power or powerlessness?