Depends on the person. =P I have some ''friends'' that I simply get along with and don't value too highly and I have some that I would at least want to save even at the cost of my life. However, we all have a survival instinct and whether we like it or not, in such a situation, it can easily get the better of us. So yeah, I would like to save the other person, but I have no idea what I'd actually do in the situation.