"Sorry," you tell them, "but I don't think I'm really cut out to do the sacrifice myself."
They suddenly look very offended and you're worried that there might be some reprecussions. You're comforted when your friend from class says, "That's okay," and you almost believe it is okay. Then he follows that by saying, "if you don't want to do the sacrifice yourself, you can be the sacrifice yourself." The others grab you; there are too many to fight off. They tie to to a large stone altar and murder you there with the same knife they offered to you, then using your blood to summon the lord of flies.