User blog comment:Xilinoc/Ch. 638 - Boiling Malice and Total Comedy/@comment-25897574-20150807093718/@comment-7805464-20150807104844

I noticed the black tendrils thing first appeared CLEARLY after Kenpachi landed a hit on it's "head", which is wonder is supposed to be the location of the chains of Pernida's fingers. So I guess the chain was kind of to "suppress" Pernida's "nerves" powers, making it smaller or kinda unnoticable and normally can only target one object and in short time. Then after the chain was cut and the Hand is free, the tendrils appears even more clearly and seems more aggresive than before.