The tale of the harpy that posed as a city guard

I had been sent by the Fighters Guild to carry out what is considered a most ordinary mission: an animal had gotten into a residence nearby and I was meant to kill it; as a final warning, the quester yelled that the beast was an harpy, so I rummaged through the stuff loaded on my cart and took a dwarven mace, for I knew this was the only weapon I had that could harm the creature.

I arrived to the house and upstairs I found the harpy; I was cloaked in my usual shroud of invisibility, so I silently sneaked to the creature's back. I was about to strike it with a powerful blow when I realized that this could be a good chance to test my pickpocketing skills (and gain some easy coins as well); I carefully put my hand in a patch of feathers , but my action was unsuccessful. The creature didn't seem to notice, but I heard a bunch of guards downstairs shouting their annoying "Halt!". I decided I would deal with them later (probably avoiding them   altogether and making directly for the exit) and focused my attention on the object of my mission. The harpy was still in front of me, unaware of my presence, so I raised my mace and struck. Blood spilled from the beast's side, but now the creature knew I was behind it, even if it could not see beyond my cloak of invisibility (probably it could smell or hear me). The harpy turned around and tried to hit me; I was unable to dodge and I felt one of its claws tore into my flesh; it was just a superficial wound and I was not worried at all, at least until a moment after, when I heard a squeaking voice: the harpy was asking me if I wanted to surrender to the city guards!!!

* Writer's note: of course, I mean that the well-known pop-up window appeared*

Still puzzled, I decided to throw down my weapon and see how the events would develop... needless to say, I was brought in front of a court to face a charge of pickpocketing... arrested by a harpy that sided with the city guards!!!