User blog comment:Crimson and Darkness/Shin DxD 3 discussion/@comment-2208155-20190822114637/@comment-2208155-20190822140148

Maybe Rias attacked the devil that has that skill that the enemy attack only works 1 time against him and she was defeated for that(nobody knews about his skill)... Or maybe is not completely right.. Who knows?

Some things can change with more spoilers..