This episode brings a grim reminder that preserving tradition and giving prayers need to also take account of knowledge and taking action. As well as the priority of caring about rules or people that some often misunderstand. Also, what's most heartbreaking is of course the inevitable reveal of Mamushi's misplaced trust. The horror of putting your trust on the wrong people and making choices that can never be taken back. The Karura familiar's condition in creating a contract is also one of the coolest terms I've encountered since it sacrifices relationships as payment.