User blog comment:Xilinoc/Ch. 608 - whatever the title of this one is/@comment-25247258-20141205010824/@comment-1268838-20141205213252

He is referring to when Yhwach was forced to return to the Schatten Bereich when he was about to attack Ichigo again. But I doubt that has anything to do with Ichibei - it was a phenomenon that Yhwach and Jugo were already well aware of.