On Monday, Machine Gun Kelly shocked the world, releasing his “Rap Devil” diss track to Eminem. The cut was originally in response to Slim Shady’s “Not Alike” song from his controversial Kamikaze album. Well, Em’s in-house producer, Mr. Porter has confirmed that he’s back in the studio working on content – including an official response to MGK. While he didn’t say when listeners could expect the song, he said that he believes Em is about to "Thanos" the rap game with the upcoming track.