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The Ninja Squad (1986)
(feddit.nl)
THE YOUNG NINJA MUST REVEAL HIS POWER TO SURVIVE!
The fate of the Ninja Empire is at stake as the supreme master and his disciple confront Ivan the Red, a power-hungry ninja. When the police fail to help, the young disciple must reveal his amazing fighting ability to avenge his mother's murder and save his sister. The master must face Ivan in a final duel to determine the fate of the Empire.
Haha! Yeah, I'm aware of Harrison's claim. I don't give too much credence to it though. He was doing Z-grade Italian genre movies before his stint in Hong Kong, so he didn't exactly have the best reputation to begin with. SE-Asian schlock is the last refuge for established actors whose careers are on the downturn.