This is what think would happen if Katniss didn't volunteer for prim at the Hunger Games. It is all in Prim's point of view.

The Hunger Games

I thought I had gone completely crazy. I knew the moment I heard my name being called, I knew that my life would be over Effie told me to come up on the stage, I thought I would fall over before I even got half way. I didn't want to die and only at my first year of being in the reaping. I started to walk up to the stage when I heard familiar shout coming from behind me.

It was my sister"Prim, No," She shouted.

And at that point I knew exactly what she was going to do. So I ran up to the stage before she could even finish. Everyone including me had that look on their face that I could tell they were all thinking the same thing as me. That I would not last a minute in the Hunger Games and everyone knew it.