User blog comment:Xilinoc/Ch. 594 (something something ech)/@comment-24306779-20140828192347/@comment-24113610-20140829025442

It makes perfect sense that Gremmy could kill with his imagination. I just think it's a lame way to kill two characters with cool powers who had the potential to have some really dope battles. But if he did kill them with his imagination, then it's as Kenpachi figured out: it will only last as long as Gremmy concentrates on it. I doubt Gremmy was focused on keeping them dead while he was fighting Kenpachi.