Stop! if you haven't finished Allegiant or are prepared for spoilers because they are in there.
Authors note- Ok so I hate that Tris dies. I went online and saw a tumblr post by AllegiantSuppurtGroup about an alternate ending for Insuregent and thought, "WHY ISNT THIS HOW ALLEGIANT WORKS?" So I decided to write it. I hope you like it!
Tris POV
I walk into the Weapons lab and see David sitting there, I'm still dizzy from the death serum but the fire in me. The will to live. It keeps me alive. He sits there and we start talking, I tell him about sacrifice and why you have to sacrifice, you can't sacrifice other. He stares at me as if in deep in thought, my mind is clear enough to know he loves my mom, so I become her, I hold myself just like her, I look at him just like her, and I talk about things I know she believed in. He couldn't shoot her and he can't shoot me, I know that I can release the memory serum to affect him immediately or to affect everyone and I make a decision. I release the one the takes away his memory on the spot and focus on everyone I love till it clears. I realize I made the selfish choice but I want to live, and if I can save Caleb from walking in her to die and not die myself then I think it's ok. I then grab an extra explosive from my bag and while David is recovering from the shock of the monody serum release the second one to erase everyone's memory and slip out of the room. Once I'm a good 30 feet away I blow it up.
That's right. I just faked my own death.