That must have been a complicated build. Assassin's Creed Unity's Phantom Blade has a crossbow and a spring-loaded blade, all hidden under the wrist. The veteran weaponsmiths of Man at Arms were able to make an awesome-looking working replica.
You can see the entire process in the video below. The soda and watermelon annihilation starts around the eleven minute mark.
Arno Dorian's Phantom Blade (Assassin's Creed Unity) - Man At Arms: Reforged [YouTube]
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