This is kind of anti-climatic. SPOILERS AHEAD
You either try to leave your friend, which ends with him leaving with you anyways, you find a kid and leave with him, or you just leave with him.
Am I missing something? Where's the sacrifice?
Apologies for the late response!
I'll be making a post-mortem soon but basically the "sacrifice" part went through a lot of changes and had to be cut down significantly due to scope and timing issues so it ended up just being the choice at the end.