The hip-hop duo was performing at the Spotify House venue at the festival in Austin, Texas, when a gig-goer climbed onto the stage and aimed a punch at the rapper.
According to NME.com, he told the audience that he flew back home to Atlanta, Georgia to see a doctor, who diagnosed him with a torn rotator cuff, and suggested he stop performing.
Mike told the crowd, "I was like, 'Doctor, I'm not leaving the road. The tour goes on!"
The rapper even made light of the attack shortly before performing their track Banana Clipper, the same one the duo was about to perform before the unexpected visitor stormed the stage.
He said, "Last time we did this song, it was interrupted. Let's not let that happen again. If you interrupt this song, we'll beat the f**k out of you."