Pasadena police Tuesday were investigating the beating of a woman by a man at a Rüfüs Du Sol concert at the Rose Bowl.

Viral video captured by a bystander showed the man exchanging words with a woman at the Saturday evening concert before unleashing a barrage of right-handed blows that reportedly left the woman unconscious.

The man apparently started punching the woman after she took a swing at him. She was treated at the scene by Pasadena Fire Department paramedics, but was not taken to a hospital.

The video has since gone viral.

The man’s face is seen clearly in the recording, which was captured as the woman and man argued over a drink that was spilled on the attacker.

Without warning, the man suddenly beats the woman down as onlookers desperately try to get him to stop.

One woma

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