(CNN) - There's no such thing as an off-duty cop. At least if it's Justin Roberts, there's not.
The police corporal from Pinole, California, was just capping off a family vacation in Hawaii. He was going through security at the Honolulu airport last Saturday, when he felt compelled to spring into action to stop a rowdy security breach.
He had just taken his shoes off to go through the body scanner, when he heard a "loud crash" off to his side, he told CNN affiliate KTVU.
"When I turned around, I saw a woman with her arms flailing, screaming at this TSA agent." He turned back around, thinking security officers would handle the ruckus. They didn't at first.
The disturbance turned into fisticuffs, TSA surveillance camera video revealed. The woman, who was trying to force her way through the security section for flight personnel, lit into the female TSA agent who was blocking her path.
He bounded over a waist-high security barrier and with a quick swoop and a professional takedown, separated the assailant from the agent and immobilized her on the floor.
Watch the incredible video for more on the story.