User blog comment:Jopjopjop/Volume 19 Spoilers/@comment-75.71.34.254-20150327004719

From the chinese translation I get that Xenovia doesn't fell Strada with a knee, but instead causes him to take a knee because he tires once she adopts her preferred 2 sword style and him being over 80 years old.

The way Strada usd the replica Durandel it seems like Excalibur wouldn't be neccesary if Xenovia mastered using Durandel completely. He was able to cut-off Rias's ultimate move because it cuts everything... no exceptions. The different ways he used Durandel combined with church training made him invincible. (Okay, this is BS but I wonder if somehow Kiba ends up with Excalibur?  It seems like it would suit him better and maybe Xenovia somehow gets Gram as a pairing with Durandel as the 2 swords that BOTH cut everything no exceptions and they are both super powerful? Her 2 sword style would be off the chart powerful if she could get the two swords to resonate.  Even though they have opposite Auras. Ishibumi might dub this "Irregular" growth brought on by close interaction with Issei  Again... complete BS.)