This didn't fly with Bieber - who himself has had a few run-ins with the law - so he intervened and "punched the guy in the face and threw him against the wall", allowing the distressed woman to break free.
The man reportedly approached the woman, grabbed her by the throat and refused to let go despite demands from Bieber and a pal.
The alleged altercation took place at a party hosted by Patrick Schwarzenneger on the night of April 14.
Former Cleveland Cavaliers coach David Blatt to interview with New York Knicks
NY also planned to contact Jerry Stackhouse - coach of Raptors 905, Toronto's G League affiliate - according to sources. There is no timetable for Porzingis' return, but he is expected to be sidelined until at least December.
According to TMZ, sources said that Justin rocked up to a party with a mate, when a random man entered the party and "went ballistic" at a nearby woman. "We're told the guy suddenly grabbed the woman by the throat and would not release her".
TMZ sources claim the "Baby" singer was at the party with a pal when the unnamed guy, who appeared to be on drugs, went insane and attacked a reported ex-girlfriend. The guy was reportedly then thrown out of the event and was soon after seen chasing an SUV that he apparently though Justin was inside of. The source goes on to reveal that the police showed up and arrested the man.
He was even seen happily posing for some photos with "Yodel Boy" Mason Ramsey who made an appearance at the festival after going viral for yodelling in Walmart.