User blog comment:Xilinoc/Ch. 549 - The Stormbringer/@comment-29183117-20130917142745/@comment-11051098-20130918230242

If "Noin" does refer to the German form of "nine", it could be that he has to be mortally wounded 9 times in a row to be killed.

BTW - remember the attack Tôsen had in his Resurrección, "Los Nueve Aspectos/The Nine Aspects"? Maybe that hints to 9 ways to die, or something. If "Noin" has a connection to that, maybe it means that BG9 must be killed in every of those 9 ways to actually die.