BlackMagic said:
That still seems like a bit of a cop-out to me. Nurari is either completely immortal and needs erased down to the last cell, or possibly he has a small vital part of himself that can move around within the larger body. While it would be possible for a sword to kill him if it was the little weakness thing, I think one of the ESPers from the Gantz team would have noticed that weakness.
Even if Host Samurai has these nifty nanomachines that can form a sword, he seems unable to regenerate his own finger, so I'm inclined to say Nurari's healing > HS and his nanomachines. No matter how I look at this, I would say it shouldn't be over with that one strike.
The more I think about it, Nurari seems like the strongest alien is history of anything. Seems like they'll have to go "firing squad" on him while he's regenerating.