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.
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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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