User blog comment:Xilinoc/Ch. 569 (You've been hit by / You've been struck by / Senbonzakura~)/@comment-2211792-20140220205734/@comment-11446176-20140221030751

I think its not so much as the fear being resisted, but more that the self belief instilled by Byakuya that is just stronger than the fear that was induced.

That, plus the As himself was beginning to fear, and his own powers of fear were probably not as strong as they were when he was curbstomping Byakuya the first time round.