shapechanger polymorph bit

shapechanger polymorph bit

Rescuing an old revision from bit rot:  If one of fog clouds or
vampire bats has been genocided and you try to polymorph a vampire
disguised as the other, it won't change form because the shape it's
currently in is the only candidate shape left for vampshifting.
This makes shapechangers who fail to take on a new shape when
polymorphed try again, specifying original form on the second try.
It's unlikely to affect chameleons, but disguised vampires will
sometimes become undisguised instead of seeming to be immune from
polymorph.