User blog comment:B214/Talk About What You Want! 3/@comment-24098614-20141231103555/@comment-24098614-20141231104336

I remember that Sona used a tactic to make Issei bleed, and put his blood on a container of sorts, and it was said that Humans that were reincarnated are easier for this tactic to work because of their Humanity, and I want to know if it is a weak spot for reincarnated Devils that wre Humans before. I remember that he used Saji to use his absorption line to not only drain but to wound him constantly, and this comment was made after the fight ended.

This happened in the Volume when Sona fought Rias, and Issei was taken out by Saji by making him bleed constantly, and I can't remember that Volume but it happens in Volume 5 because the Young Devils meet during this Volume.