Pretty interesting! Someone went far out of their way to make a working model that not only has a spring loaded blade (well, a fake wooden one at least) but also a crossbow that can actually fire! (as well as spin back to it’s “away” position). Last year I put something together for Halloween themed around Assassin’s Creed. After the holiday I got my hands on a wrist blade that works, but this one kind of makes it feel a little lacking in the fun department. Nice job!

Of course, if you aren’t as crafty when it comes to fabricating your own cosplay weapon, there are plenty of Assassin’s Creed wrist weapons available online (examples) that you can use for your costumes.