Creative Vision / Rationale / How Did You Incorporate the Theme
We see generosity as an action you take for another, that has no benefit to you. And often times that action is at a cost to yourself. By giving up your oxygen and dragging this unconcious person through the game you are putting in a lot of effort towards an NPC with no known connection to you, you do it because it is the kind and generous thing to do. The game will no reward you for it, beyond unlocking different endings.