User blog comment:B214/High School DxD New Episode 6 Discussion/@comment-99.120.148.87-20130812042755/@comment-1359322-20130812050442

Yeah even if they continued fighting Kokabiel they would still lose, so Vali didn't steal Issei or anyone's victory, he saved everyone's lives there. Remember there was a 20 minutes time limit there before the self destruct magic circle destoy Issei's town.