User blog comment:B214/Volume 23 discussion blog/@comment-1359322-20170519103917/@comment-31137559-20170520212355

Depends on whose magic and demonic powers it belongs to. Could Issei just knock away Serafall's demonic powers? Could he do it to Diehauser's? Issei could knock away Rias' POD I'm sure, but does that mean he can knock away Sirzechs'? Not all demonic powers and magic are equal. Some people's magic is far stronger than other's. Some people's demonic powers are far stronger than others. Issei is a power-type so he would take the attack head-on and knock it away. Kiba isn't a power-type but he could easily defeat power-types depending on who it is.

Well Issei uses his demonic powers, not magic. And Issei is primarily a hand-to-hand fighter not one who fights with magic and demonic powers as his main focus. It's due to Issei being insanely strong that he can knock away others' magic and demonic powers with brute force. He doesn't have to be good at magic to knock it away. Heracles doesn't use magic yet he took Rossweisse's magic like a champ. Yes raw power can defeat things like technique, tactics, and a balanced skill set. The same could be said vice-versa. The thing you need to understand is that Issei is the exception, not the norm. Issei isn't just some regular power-type. Rias and Akeno are power-types but does that mean they aren't susceptible to techniques? It all depends on the level of power Issei has. Can Issei defeat Sirzechs although Sirzechs is a technique-type? Could he beat Ajuka? It really doesn't matter what kind of fighter you are. Whether you're a power-type or technique-type. It's all about your level. Kiba is very strong and his strength lies in his techniques. The same for Cao Cao.