Here in mexico, mind you, no one would give a fuck.
And the point is stabbing in a place where it's not necessary to slash or do any additional damage. Theoretically anyway. I'd imagine a quick series of thrusts would be potentially lethal and not as messy as if you stabbed someone and left your hand in there dramatically like Ezio Audimotherfuckingtore
Wouldn't having to manually retract the blade defeat some of the purpose? Also the mechanism to automatically extend and retract the knife would be cumbersome and it would be a game of hoping there's enough pressure to release and extend the blade far enough that it can build enough pressure for the retracting springs to do their job and then hoping the retracting can create enough force to pull the blade back in and reset the extension spring.
In almost all states they're banned as are switchblades, some states even ban gravity and butterfly knives.
"Ubisoft boss Yves Guillemot has teased that the next [Assassin's Creed] game would feature an all new hero and would take place in a different time period… Now some news has come to light via a reddit discussion, indicating that the next installment of Assassin’s Creed has been given the name “Assassin’s Creed IV: Black Flags”, has a logo, and that it may have a seafaring theme." Says Game Freaks
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And now I can't get the image of a Captain Jack Sparrow like main character running around in the next Assassin's Creed.
I GOT 'DEM HUMPS. Doctress Who:You can be my Brony bitch ;D Droctress Who:Jas, would you like me to make you a sandwich? JesusChrist: Well if you insist Jasthn I'll use it with you. Spread them cheeks Tragedy_and_Comedy: Jas is about as dangerous as a kitten. Blood Lord:I hit your dog with mah truck. :3 Lenore Celestalis:*jumps on your back* weee~
I didn't even think of a ratchet mechanism. The problem is to scale the blade from plastic to actual metal would probably require a much heavier version probably with the whole thing made out of metal and much heavier bungee cords or springs instead of a rubber band. Especially if you want to do the put your hand on the target stab and retract.