User blog comment:Fairy Tail Grand Master/What is the hidden blade made of?/@comment-4636255-20120627163359/@comment-4740457-20120628022218

Someone's gone through their Physics book :P..Oh Pascal!!...... Well the force(thrust) of the hidden blade and sword cannot be compared as the length and the actual momentum developed by the sword is much greater than that of the short hidden blade...so though the sword may go through the armor the hidden blade lacks in generating enough thrust power to really go through the armor...this is one of the those thing!