Impossible. He's an American. How can he be a ninja?
4 seconds sound clip from the Revenge of the Ninja movie soundboard.
You can hear this line at 01:02:29.671 in the Blu-ray version of the movie.
Quote context
[...]
- Take her and hold her with the boy.
- Braden?
- Yes. He's a ninja. He betrayed me.
- Impossible. He's an American. How can he be a ninja?
- He lived for 20 years in Japan. He trained Koga Ryu style ninjutsu.
- We've got to stop him. I'll call Lt. Dime.
- This is no job for the police. It's something I'll have to do.
- Only a ninja can stop a ninja.
[...]