The second stage is to move force in your fingers. To take a firm grip on the thing.

11 seconds sound clip from the Shaolin Chastity Kung Fu movie soundboard.

You can hear this line at 00:41:05.433 in the DVD version of the movie.

Quote context

[...]

- Beating water is the next stage. The speed must not be too fast, or too slow. Breathe in and retract your fist. Breathe out and strike out.

- Each of your blows must be strong, and keep your arms close in to your body.

- Catching claws are mainly for attack. It has two stages. The first stage is barehanded.

- Catch! Withdraw. These are the basics.

- Catch quickly! Tight withdrawal.

- The second stage is to move force in your fingers. To take a firm grip on the thing.

- Now we'll practice closing hands. In this, you use your palms to grip and to twist. When you've mastered this, you can break anything in your hands.

- No love, no lust. Concentrating one's mind totally. That is the secret of kung fu.

- The energy, the air, the spirit, that's the true self.

- Now if you follow these rules then you'll become strong in both body and spirit.

[...]