They're also expert in the art of stealth and of ambush. They are like the wind. They are very hard to catch. I'm afraid that's all I can tell you.

17 seconds sound clip from the Ninjutsu (1968) movie soundboard.

You can hear this line at 00:11:26 in the Blu-ray version of the movie.

Quote context

[...]

- They were ninja. They'd only be waiting for the general.

- But you're too young to be the general, and I heard the general has a son serving in the army. It's reasonable to suppose he'd send his son.

- This is a catalog of ninja skills.

- The Japanese ninja use eight main skills: breathing, nimbleness, the sword, the lance, the dart, gun powder, swiftness, and suppleness.

- Besides this, they've perfected the art of escaping. They can break free from tight bonds.

- They're also expert in the art of stealth and of ambush. They are like the wind. They are very hard to catch. I'm afraid that's all I can tell you.

- I obtained this book when I was in Japan. I used it to teach my three best students, and now, I'll give it to you.

- Thank you very much. I'll use it well.

- I know my nickname is The Master of The Three Arts, it's true I had three students. To each I taught one art.

- The eldest is an expert at running, climbing, jumping.

[...]