there is a hint that it will be set in the Renaissance because of that guy with the bunch of arms, very famous Renaissance drawing. Used in many books to show the Renaissance example the Medici Seal by Theresa Breslin. A little bit of nerdy info but hey, i think it helps. The guy with the short blade had all his fingers, aren't they supposed to cut off one of their fingers to a certain limit.
It almost looked like the man's arm was robotic at 0:19 O_O. I thought they just cut of the Ring finger of the left hand and put a blade device under your arm. And yes, the wings were a clue too.