I guess I'm slow, but I just put two and two together with our conversation with 'Withers'. He asks us how we measure the value of a life, and says something about if we'll follow through with our answer. I bet he's foreshadowing the choice we'll make regarding who lives and who dies later.
Sorry if that was more obvious to everyone, I guess I only thought of it recently with all the talk of the party being locked.
