User blog comment:Xilinoc/Ch. 541 - THE BLADE AND ME 2/@comment-7924893-20130612200535

I honestly don't believe that Kubo has just thought this up on the spot, he seems to have planned this out quite a bit, not to mention remember Ichigos fight against Kenpenchi when 'Zangetsu' clotted up Ichigos blood, that right there seems a hell of lot like some form of blut vene to me