User blog comment:Jopjopjop/High School DxD BorN episode 3 review/@comment-3965848-20150419201204/@comment-26209278-20150419203132

But killing him was not good enough for a punishment, better to keep him alive and in fear of him...

Oh, and also the trouble he would of gotten in for killing a high-class pureblood devil, that's the brother of the current Beelzebub...