Unless you want to be caught as a prime suspect to murder, as might be assumed if you are witnessed butchering a missing person of the trade guild, and furthermore tried for said butchering at the very least, you should try to be more discrete.
>behind a rock
That is not out of plain sight to passers-bys which are likely to occur within the hour.
It would turn "Dungeons and Dragons" into "Court proceedings and Murderers". Not to mention intent to force cannibalism on chained children.
If they don't know, it won't hurt them. Prions aren't a thing in this world.
