That's when Bieber stepped in, punched the guy in the face and threw him up against the wall.
Bieber has been spotted in several photos taken at the 2018 Coachella Valley Music and Arts Festival and posted online.
Sources told the outlet that a man grabbed a woman, who could have possibly been his ex-girlfriend, by the throat and refused to let her go. The Grammy victor and his friend then started yelling at the dude to release her, but he reportedly only screamed back, "Go f*** yourself" as he continued to hold his grip.
Inside sources at the party say the man who went insane on the woman appeared to be on drugs. The timing there finally allowed the woman to escape his death grip and run away. That's when Justin allegedly punched the guy and shoved him up against the wall, which freed the victim.
Manchester City win Premier League title as rivals United lose
However, United's record £89m signing followed it up with a underwhelming display on the left of midfield in a 4-3-3 system. Romelu Lukaku saw a header saved by Ben Foster in the second half but, other than that, United rarely threatened to score.
We're told the guy was thrown out of the party and a short time later, was chasing an SUV. apparently believing Justin was inside. Also in the Instagram snap, which received over a million "likes", were singer The Weeknd and Call Me By Your Name actor Timothée Chalamet.
Local police officers arrested him later that evening.
HollywoodLife reached out to Justin's rep for comment.