Devil Replica

Something happened during the hyperresonance that teleported Luke and Tear to the Malkuth Empire. Let's just say, Luke goes nuts. He becomes a gun-toting, sadistic, (including a few appearance changes), bizarre Devil Replica. What do you think everyone's reaction would be? How will everyone survive? My first fanfic. Don't care if you flame. No pairings. Rated for Luke's mouth.