On his diss track, he would have slaughtered machine gunn kelly. But I think he feels diss track should be "hard" but sometimes pure skill is enough to make someone look silly. Em's verse closes the 9 minute song.
The only person to defeat Em in a battle is Mariah -- she killed him in the song/ video and it was a huge hit. Her dressing up as him with the hoodie and goatee is funny.