I just logged into an old(ish) fort of mine, and after a few minutes of expanding, a feathery scorpion FB appeared in the cavern lake I was using for water (I embarked on a glacier/taiga area).
Couple minutes later, he appeared in my fort, probably teleported up the well somehow.
He chased everyone out of my shallow-dug fort, and was in the walled-in trade zone of the surface, and was being attacked by a stray dog. I then set my militia on him, upon realizing he was doing nothing to the dog.
I realized he was STILL not fighting back, and drafted the rest of my dwarfs and set all 17 or so of THEM on him. (None of my dwarfs ever so much as used a pick on him, I have no weapons)
Within a minute, I checked reports, he had done nothing but push a dog twice. Then I checked his wounds...Everything in his body was broken (Complete function loss. He was a vegetable at this point, lol), except for his stomach, which was just "partial loss."
He died within 4 minutes from the ceaseless pounding. I then managed to butcher the "Towering feathered scorpion" who had lost his stinger to a dog, giving me over 360 FB meat. My fortress is hereby existing on nothing but FB products for a LONG, LONG time. He reached 15 pages of hit reports, and did nothing but push dogs no more than 6 times. I think that is the reason he had no titles, and perhaps not even more than a couple troglodyte kills, though I haven't checked his kills yet. I think I need a military, in case the next one can fight back.