Bennet had been spotted out in the street by security staff that morning clutching a bottle of vodka and CCTV later captured him sprinting towards his partner near the venue.
He was later seen seizing her by the neck, violently shaking her back and forward and holding her for 10 seconds.
Fiscal Josh Dowie told the court how Trainspotting and Braveheart star Mullan tried to come to the woman’s aid after noticing her crying.
Mullan asked a member of security at the venue if the woman was “okay” and was told police had been called.
Dowie said “Mr Mullan turned around towards Bennet and the woman to see him assaulting her.
“He turned back and intervened then stood between them.
“Mr Mullan told Bennet that the police had been called and at this point he was headbutted.”
