 Warren Ellis took over the title in 1999 , after his work on <unk> which had moved to the Vertigo imprint , following the closure of <unk> Comics . He was meant to become a full @-@ time writer for several years , as Delano , Ennis and Jenkins before him , but left the title early after DC refused to publish the story " Shoot " , about high school shootings , following the <unk> High School massacre , despite the fact it had been written and submitted prior to the event . The story was finally published in 2010 . 
