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Astonishing surveillance images show the moment a brave good Samaritan tackled California dance club mass shooter Huu Can Tran — grabbing his semi-automatic assault pistol even though he was certain he was about to die.

Brandon Tsay, 26, was seen brawling with the 72-year-old shooter as he burst into the Lai Lai Ballroom & Studio after already shooting dead 11 people and injuring as many others at a nearby dance hall in Monterey Park late Saturday.

The computer coder told “Good Morning America” Monday that he thought nothing of hearing the ballroom door closing — until it was “instantly followed by the sound of a metal object clinking together.”

“That’s when I turned around and saw that there was an Asian man holding a gun,” he said of the terrifying scene in his family’s ballroom.