i always thought that the wristblades were controlled by movements in the hand/wrist. as a safety precaution the wrist must be clenched shut before the wristblades, activated by muscles in the forearm, are extended. it is very easy to beleive that to be true, we have that technology right now. the technology is used on people with prosthectic limbs, especicially people who have lost their hands, and have robotic 'hands' or hooks that open and close, when the proper muscle is flexed or contracted in the forearm.
i also noticed the wristblades changing shape to fit around dutch's head. the only two things i can say is like P R E D said they expand or it was just a 'movie' thing, jsut for effect
Clan Balatu
Struggle is The Glory