Noticed while composing a reply to the #H5547 report about named
vampire shape-shift message. The message when a vampire (possibly
in vampire bat form) turned into a fog cloud in order to pass under
a closed door was using a stale cached mon->data value when choosing
the verb. So normal fog cloud or vampire already in fog cloud shape
would "flow" under the door, but newly shifted fog cloud would "ooze"
under the door. I saw this while testing the previous patch but its
significance didn't register at the time.
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