User blog comment:Xilinoc/Ch. 613 - The Ordinary Peace/@comment-11446176-20150129134300/@comment-1338810-20150130075054

I think she was just clutching the file under her shoulder. But I too thought she was reaching for her book and/or the Zanpakuto in her sleeve, until I saw she wasn't. That being said, Nanao is one of the other few who have been in the Gotei 13 since they were children; it wouldn't surprise me at all to see that she is remarkably powerful.