I think Muzaka wants to be killed by Rai. He threatening human and Rai friends so that he can rile Rai up to killed him. If i remember in one the chapter Muzaka said he can go on his monster rampage again and i'm thinking Muzaka does not want that. So, the sooner Rai kill him the better before he loose his mind and go on a rampage and not be himself. So Muzaka want to die as himself and not as a monster.? lol my guess.
I think Muzaka wants to be killed by Rai. He threatening human and Rai friends so that he can rile Rai up to killed him. If i remember in one the chapter Muzaka said he can go on his monster rampage again and i'm thinking Muzaka does not want that. So, the sooner Rai kill him the better before he loose his mind and go on a rampage and not be himself. So Muzaka want to die as himself and not as a monster.? lol my guess.