From a bug report, having hallucination time out while
mimicking an orange (instead of gold, after eating a mimic corpse), you'd
still get the hallucinatory end-of-mimicking message about not wanting to
be peeled. If hallucination state is toggled, update the pending message
and change the hero's appearance. In practice, only the orange-to-gold
case can occur. Anything which might trigger gold-to-orange will have
terminated the hero's mimickery befort that happens.
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