User blog comment:Xilinoc/Ch. 561 - THE VILLAN/@comment-1904799-20131212025558/@comment-1904799-20131212041958

There's also the fact that Mask, who supposedly is unable to hear due to crushing his own eardrums (the dubiousness of that notwithstanding) actually asks Renji a question at the end of the chapter. As if he could actually hear his response.