Actually, Hajime feel they could be a good match if they fight against the two-tailed wolf. Although they didn’t have peculiar magic to manipulate thunder and simply had inferior offensive power compared to the two-tailed wolf, sometime, they evaded the location Hajime attacked as if they knew about it, so their peculiar magic must be something along “Prediction” system. Following that, their coordination would make them the same level as the two-tailed wolf… in other words, it wasn’t strange for the demonic beasts to be in the so-called low layer of the Abyss.