@WhoopassGirl I feel like sharing would establish yourself as being worth more alive than dead in a survival situation. I mean at that point it's well beyond being about the food and the scope of selfishness and more about the moralities of a kill-or-be-killed situation.
Regardless of motive however, if you know for certain that someone is going to try to kill you, the best move would be to kill them first. Which I could never do, I'd for sure get murdered