User blog comment:Zathronas/Analysis by an author: Volume 2 episode 1/@comment-24.141.231.101-20140725025148/@comment-11188061-20140725030837

I did deduce since Players & Pieces that Ren is the weaker one and Nora the stronger, along with some scenarios of their background where child Nora defends child Ren. At that time there isn't enough supporting evidence, but this Episode helps for sure.