User blog comment:Xilinoc/Ch. 554 - Desperate Lights/@comment-5698464-20131023182528/@comment-5698464-20131027220856

Well I don't think Aizen was actually affected. If I remember correctly I am fairly certain Aizen was "playing along". He had suigetsu enacted at the time and Shinji's attacks/hits were just a hallucination created by Aizen.