I think some people are taking this game a bit too seriously. The Shaman fights, the shaman killing everyone, and just the chaos ans wackyness of what happens is part of the fun. If you don't like it go to a more serious room, if the shaman kills everyone make the best out of the bad situation and laugh it off. It's best if he tricks everyone into jumping onto an invisible platform or something. Nine times out of ten the shaman killing everyone won't even end that badly for you. So basically
CALM
THE
FUCK
DOWN
Also farmer mouse Genny is adorable