Absurd? Hardly. Ravenloft is not a nice place for people 'fighting' the system. Strahd tolerates uprisings only so far as he is really directing and controlling them. He gets to use the mist for whatever he damn well wants to.
I had an amusing incident in my game where a player sent their familiar into the mists and heard a thud as the bird dropped like a stone.. Alive but stunned. THey learned quickly.