actually when i first vsed them i killed them with not much problem its coz i stumbled on the best way to kill em, get em both down to critical health then kill one right after the other so neither gets a chance to merge the swords and wup your as5. their attacks are really simple, air hikes your best friend with air hike theres not much trouble, jump behind em and start slashing. how do you knock the sword out of their hands? coz i wanna end the fight soon as i can, i've only done it out of randomness. =]