When the Inquisitor is first noticed to go to the village he must trek many days if not weeks to get to the monastery. Yet, when he first examines the body, now dead since before even the inquisitor was summoned, there is no obvious lividity or stiffness of the dead body. By this time it should be beginning to decompose and the muscles very stiff, almost board like.
When the inquisitor arrives he passes 2 monks using potato peelers. Potato peelers were created until the 1800's. Prior to that knives were used.