User blog comment:B214/Volume 23 discussion blog/@comment-77.188.219.183-20170424210635/@comment-31137559-20170425164622

Did he battle Grendel one-on-one? Did he battle Trihexa's core one-on-one? Issei is smart enough to know when he can't take down an opponent alone. For example unless it's Sirzechs or Ajuka, devils can't solo gods. Now if it's a group of powerful devils that's a different story.