In the novel at least, Jake doesn't die, it's Melissa trying to teach him what it feels like to be observed at all times without permission, also to prove she is stronger than she looks and has an idea to make Jake realize that Yuri doesn't need constant protection, and that, again, stalking is wrong and creepy, but she lets him go and makes sure he survives and he comes back to being a human, just one that is a bit more scared of his sister than he used to be.