Board Thread:Questions and Answers/@comment-208.174.57.186-20121208051539/@comment-3329304-20121209165822

In depth thought nicely put in words I must say. Yes, it is indeed a little unexpected draw in battle. But we do see that Saya has been drinking Hagi's blood after Riku's death (remember the battle with James on the opera stage?) However, that brings up another question... wasn't Saya near to hibernation that time? Assuming she drank adequate blood, still her duel should look impractical compared to the frequent fainting spells she was having. There is only one obvious answer in case of every heroic characters ~ willpower. In this case, perhaps Saya's determination to get rid of Diva once and for all and finally fulfill her mission without spilling any more human blood, helped drive her throughout the final duel.

Supposing it was none of the above and the creators had indeed made a 'mistake' in detailing; it was covered up in the manga which released after the anime. In the manga, it was Nathan who killed Diva (the same way anime Saya kills Karl). There Saya couldn't bring herself to kill Diva at the end and the two sisters somewhat reconcile?! Unusual turn but avoids the power level question.

btw...good questions. I'm having fun. Would love if you keep it up :)