Mounting and Placement. For any wrist mounted blade to have the stability and strength to be used effectively, it must be properly mounted. This means a solid (inflexible, like steel, very thick/stiff leather or wood) mounting platform, preferably formed to the shape of your forearm, and a minimum of two straps to keep it in place, one at either end of this base. Your best bet would be to use the entire length of your forearm, with a minimum of two straps, one placed at the wrist and the other just before the elbow, to maximize the weapons stability. Altair has this covered quite nicely, as he used full length bracers with three straps:
sorry but the ring idea means that the blade could fly out any time the ring flexes past the point to release the locking mechanism. think about it, if Altair grabbed a ledge and rocked back and forth his wrist action would be enough to release the mechanism. it would probably cause him to lose his grip or damage the blade. i think thats why they offer the button mechanism in the teaser. you press it with your middle finger, removing it from harms way.
Wrist knives are also a common feature in sci-fi and fantasy armories. Concealed wrist knives are often carried by ninjas and other assassins. Some of these fantasy weapons have retractable blades or are capable of catapulting a knife across the room. One of the most famous wrist knives belongs to the character Altair from the video game Assassin's Creed. One of Altair's signature weapons is a concealed wrist knife with a retractable blade, which he uses for quick assassinations.
