Think about this for a sec. Destiny already, has a sweet sword fighting mechanics and 3rd person view, adding a few new tricks (block, evade and dash for example) can lead to a game mode never seen before in FPSs. Swords and sword mods u can only buy with points earned from Intelligently planned challenge previously played (to increase replay value), from completing a samurai guardian specific bounty (to make the game mode more stand alone and not affect the already planned structure of the game) or some other way bungie decides to go with. Destiny has already proven to be a solid source for unique entertainment, I'll love to see it get stronger. Thank you for reading