Who says so?
3 seconds sound clip from the The Invincible Armour movie soundboard.
You can hear this line at 00:28:33 in the DVD version of the movie.
Quote context
[...]
- You planned well, you and Hu Lung, to kill Mr. Lu, and now me, so nobody knows your secret.
- Stop pretending. It won't help you.
- He's in my custody. Sorry, you can't have him.
- I warn you: don't try to interfere or I may have to hurt you.
- Two weeks, and we haven't heard a single word from Shen Yu.
- My lord, Shen Yu is used to working alone.
[...]