"Here's the question, there are three people. Person A, B and C. A and B are friends while C is their common enemy. A and B are enjoying their time on a stroll together and C ambushes them. Looking at how happy they are, he decides to make their life even more miserable than he previously was going to.
C is much more powerful than A and B and therefore, easily traps them. To toy with them, he gives them a cruel dilemma. It was wether they would opt to spare or sacrifice each other. He gives them time to discuss but neither will know what the other chose until their decisions are locked in.
C told them the following things about sacrificing and sparing
First, If both choose to sacrifice each other, he would cut one limb each from them.
Second, if both choose to spare each other, he would cut three limbs each from them.
Third, if one chooses to sacrifice the other person, he would be spared and be freed while the other person would be killed.