Rather than Stinger and Knock it should be Piercing and Blunt, since its referring to the type of attack and in most jrpgs thats how the physical attack types are seperated in.
Shame it had to be axed before the Deadman's Book or Zel's backstory could be explained. Though I do think that whoever's idea, whether the editor's or the author's to do that long flashback for Rosalie probably had something to do with it. Seriously should've just kept it to 3 chapters.