After Mariz and Vendetta dragged them back from the water battle two nights ago, Nadin had been thinking hard about his own power growth. Back when he first made a contract with a demon of wrath and caused major explosions in his home country, he was already so satisfied.
He felt so invincible that the police couldn't even do anything to him. He could slip in and out any place he wanted and detonate each however he wanted. The first few years were a fantasy… until he got bored with aiming at places and doing hits randomly.
That was when he decided to hunt down a few witches and see their power for himself. He found Carmina this way… as well as his way to Satan's coven. All this time, if he wasn't walking in the air, he was bored to death.