Harmoire had to transform into a Human in order to summon his minions with the magically infused weapon. Harmoire is one of the Inn's living people.
I would have gotten away with it too, if it weren't for you meddling kids!
My true identity is revealed!
Mwahahaha! Not just an armoire... I am the Harmoire! You really believed that a mere mortal had the magical capabilities necessary to control inanimate objects? FOOLS!
That I am! I had to transform into a Human in order to summon my minions with the magically infused weapon! Do you know how hard it is to hold anything without opposable thumbs?! And now, it is time for you to see the durability of an all-oak armoire!