User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-4547267-20150612155152

"I am not going to be your substitute, Issei-kun. Aren't you Rias Gremory's Pawn"

Sound like Issei is planning on either going after Ravel attacker which Kiba overhear and try to stop him before getting himself killed or planning to leave the group when he realist the enemies are after him then the others?